You're at every
practice.
You're still flying blind.
One band on your kid's wrist. Every rep of every sport, all year. The development story that no coach, no radar gun, and no single-sport tracker can tell you — finally visible.
Know what's happening to your kid's arm before their body sends the bill.
One wristband. Auto-records to onboard storage — no phones at practice. Charges weekly. Works for baseball, softball, football, soccer. The first product that follows your kid from April baseball into August football into spring soccer and tells you what's actually happening to their development across the year.
You did everything right.
You still didn't know.
You know the drive. Three hours on I-75, tournament bag in the trunk, $400 for the weekend — hotels, entry fees, gas, food court baseball. Your kid has been practicing four nights a week since February. Working harder than you've ever asked.
You watch from the bleachers. They look fine.
In late July: 68 pitches Saturday, felt good, 54 more Sunday. Two weeks later: August flag football. Snaps, drops, 60 throws a practice — same arm, different uniform. The soreness showed up in week three of football. The doctor asked about their schedule and just nodded. The coach called it bad luck.
It wasn't bad luck. They'd been saying their shoulder felt "weird" for two weeks. You gave them ibuprofen and told them to warm up.
You are not a bad parent. You had nothing to look at. Every rep thrown from April through August — gone. No record. No baseline. No way to see the load stacking across two sports with two coaches who had never spoken to each other. You were flying completely blind, and so was everyone else on that field.
The words parents say afterward are always the same: "We didn't know."
That phrase — we didn't know — is the most expensive sentence in youth sports. It follows a lost season. Sometimes it follows surgery. Almost always, it follows a warning that was there in the data and invisible everywhere else.
You are already spending $3,000 a year on club fees, private lessons, and tournament travel. The hitting coach says "trust the process." The speed trainer says she's "making gains."
You have no idea if any of it is actually working. You can't prove progress. You can't see the trend. You're taking everyone's word for it and writing the checks.
We’re spending $3K a year. How do I know it’s working? Looks the same to me.
I ask the coach what they need to work on. I get ‘doing great.’ I have zero data to push back with.
Are they getting better or just getting taller? I genuinely cannot tell.
Single-sport sensors
The bat sensor dies when fall ball ends. The kicker sensor never sees them swing. Their three sports' coaches don't talk to each other. You'd need three products that still can't see across the whole year.
Velocity guns and radar
Peak mph misses the "dead arm" accumulating on the inside. The kid throwing 78 mph with collapsing mechanics — the one with "miles on the tires" — looks identical to the kid who's fresh. The radar won't tell you which is which.
Your kid's self-report
He says he's fine because he wants to play. She hides her pain because she's afraid of losing her spot. Kids at this age are not reliable reporters of what their bodies are actually doing. You already know this.
The only thing that changes "we didn't know" into "we saw it coming" is data that travels with your kid across every sport, every season, every rep — and tells you what to do before their body does. That's the only thing we're building.
Sense. Score. Signal.
Improve.
One band on the wrist. Four scores against their own baseline. Live feedback in the moment. A weekly arc for the coach. A drive-home summary for you. A Season Card at the end.
The wrist captures every rep.
Wristband on the throwing hand. Ankle strap for kickers and soccer. Auto-records the moment it senses motion. No phone open. No app to launch. No syncing at the end of the night.
Auto-record · 6-hour battery · weekly charge
Four numbers, calibrated to them.
Mechanics. Power. Consistency. Workload. Each scored 0–100 against your kid's own April baseline — not against an average that includes some other kid's body.
Self-baseline · 0–100 dashboard · workload zone alongside
The apps signal the right person, fast.
Coach phone flags drift live during practice. Parent phone pushes a PR notification before the kid gets to the car. Kid sees their reveal seconds after taking the band off. Three audiences, three phones, near-real-time.
Coach live · parent push · kid post-session reveal
The trend tells everyone what to do next.
Coach gets a flag with a drill. Parent gets a 3-bucket summary on the drive home. Kid earns a level. The system turns one practice into next-practice action — and a season into a Season Card.
Coach actions · parent summary · kid leaderboard
Put the band on your kid before they walk onto the field. That's it. Everything else is automatic.
Strap on the band.
The phone walks them through it.
Every other youth wearable starts with: download the app, pair the device, find a setup PDF, hand it to a parent. Ours starts with the kid putting on a wristband. The setup app voice-prompts them through three minutes of guided baseline reps. The band collects on their wrist. After 15 reps, the system knows their easy, their medium, and their max from rep one.
Without baseline calibration, every coaching score is comparing your kid to someone else's body — a stranger's average. After calibration, every score is graded against their own ceiling. That's the difference between data and coaching.
Welcome, Pruitt.
The setup app knows their name, sport, and position from a 30-second parent setup. The band is on their wrist. Ready in one tap.
Five easy. Five medium. Five max.
The phone voice-prompts the next step. Kid does the reps. The band counts. The phone counter ticks up. No supervision needed.
Pruitt's profile is built.
Every rep from now on grades against their own scale. April Pruitt. May Pruitt. Year-from-now Pruitt.
Three reveals.
Three phones. Three audiences.
The band is purpose-built — a sealed coin sensor in a sport wristband. No screen, no on-board processing, no real-time analytics at the wrist. What it does is collect every rep with research-grade fidelity and stream the data to the apps the second it's in BLE range.
The magic isn't on the wrist — it's at the phone. Three phones, actually. Coach in the cage, parent in the stands, kid in the dugout. Each one gets the moment that matters to them within seconds of the rep.
Lila just hit a season-high 96 Mechanics. Tee work paying off.
Three things: improved · watch · do. Tap to read.
Yellow zone. Easy soccer day Sunday is fine.
All processing happens on the phone or in the cloud — within seconds of BLE handshake. The band's job is to capture honestly. The apps' job is to surface what matters.
Score crossed an all-time high. Kid sees it post-session, parent sees it on the drive home.
Coach phone gets the flag while practice is still happening. Pull the kid for 5.
The kid's phone summary leads with what they crushed. Reinforces the right pattern.
Soft note to parent. "Easy soccer day Sunday is fine." Coach gets the same heads-up.
Band synced. Reps captured. Three-bucket parent recap and full coach session report — both queued.
Dumb sensor. Smart apps.
Forever.
Most wearable companies put their intelligence on the device. Then they're stuck — firmware updates fail, hardware ships once a year, every algorithm tweak needs a recall. We put everything important at the apps. The band you put on your kid's wrist today will get smarter every week — not because we replaced the hardware, but because the apps got smarter and the data was already captured cleanly.
No on-device compute = cheap hardware. Every parent can afford one band per kid.
Battery measured in days, not hours. Charge weekly, never mid-game.
No screen to break, no haptic to fail. Single-purpose collector.
Apps update weekly. Same band today is a smarter band a month from now.
Yes — we considered it. Then dropped it. Adding LED + haptic doubles the bill of materials, halves the battery life, breaks the seal, and locks scoring intelligence into firmware that ships once a year. We chose the architecture that gets cheaper, lighter, and smarter over time — not heavier and more expensive. The band collects. The apps coach. That's the bet, and we're keeping it.
Four numbers.
Every kid. Every sport. Every season.
Mechanics, Power, Consistency, Workload. Each scored 0–100 against your kid's own April baseline. Not against an average. Not against the cohort. Against themselves last month. Coaches see them. Parents see them. Kids chase them.
How repeatable the swing/throw path is rep-to-rep. Pure motion-pattern math.
Burst output relative to their own ceiling. Not mph. Their body's explosiveness.
Variance across reps in the same session. Lower variance, higher score.
How well the score holds session-long. The fatigue-resistance score.
It's a green / yellow / red zone telling parents and coaches when to check in. Higher isn't better. Balanced is better.
Each level is one notch of growth across the four scores. Tier shifts at 25 / 50 / 75 / 100. Can't be bought. Won't reset. Pruitt is Level 47 · Gold tier — 3 more levels to Elite.
Up 12% from your April baseline.
Not vs other kids. Vs you in April.
Score moved to 96 today.
From 89 last week. The trend is the win.
Best session of the season.
Your top number, your scale, your year.
13 videos. 71 cues. 9 metrics.
In one day.
We ingested every top YouTube coach in baseball and softball, extracted their verbatim teaching cues, cross-checked them against 97 real pitches from our cleanest dataset, and shipped two new measurable coaching signals to the detector — every one anchored to a real coach’s real teaching.
Driveline, Tread Athletics, Paul Nyman, BTBY, Dan Blewett, Amanda Scarborough.
6 of the top YouTube coaches in baseball and softball — every one with verified audiences in the hundreds of thousands or millions. Every video ingested, transcribed, and structured.
Not paraphrase. Not summary. Word for word.
Every drill name, every correction, every term a top coach gives a mechanic — pulled exactly as said and stored in a structured library the app can pull from when a kid's number moves.
Rich's May 9 session. The cleanest dataset we have.
Found two coaching signals nobody else's wrist sensor measures. Killed a third candidate — early trunk extension — because the data said no. Honest kill is the point.
Up from 5 this morning. 7 shipped. 2 candidate.
Elbow In Plane at Landing and Stop-and-Restart Trough both shipped to the detector today — each anchored to a coach who teaches it on YouTube with their own words.
Where 3+ coaches independently converge on the same cue
RAG-searchable, lives alongside session data
Gyro-trough rewrite: 17/97 → 91/97 reps detected
Driveline · Tread · Nyman · McCreary · Blewett · Scarborough
Single-founder, AI-assisted development cycle. What used to take an academic research lab six months — ingest the coaching literature, cross-reference it against real biomechanics data, validate which signals are detectable from wrist alone — happens in a day. That’s not because corners were cut. It’s because the internal stack is purpose-built for this problem. This is the speed advantage the founding cohort gets, and that no competitor can match without building the same stack from scratch.
Every number above is traceable: 13 video ingest files in learning-repository/business/statterbox/, 71 cues in coaching/cues.json, 18 clusters in coaching/patterns.json, 97-rep cross-check in the May 9 session pipeline. Money 8 (early trunk extension) killed because 97 reps said the signal was not detectable from wrist alone — included here because an honest kill is the same proof of rigor as a ship.
What the YouTube giants teach.
What one wristband measures.
Nine Money metrics. Six coaches with millions of combined views. Every score in Statterbox traces to a verbatim cue from a real coach who teaches it on YouTube — and the app surfaces that coach's exact words to the kid. Not generic gym-speak. The words the coaches themselves use.
The biggest immediate velocity limiter is the position of the elbow at landing.
The elbow is not in plane with where the trunk is rotating so most of that energy is not actually making its way out through the humerus and ultimately into the ball. Watch the path the elbow has to take — the elbow has to take this scooping path where it goes up and underneath and then gets back up into plane closer to release.
Pendulum throws, lasso drill to fill that arm up and in plane as opposed to down here — and what does it feel like to get it up and actually rotate down from this point and get downhill versus rotating and having the elbow climb? Maybe you have a low elbow at landing. So maybe we need to check scapular upward rotation. Make sure your scap can actually get to that position — or is the lat dragging it down?
What's the value of my M when I come to the stop? Zero. Zero. So I've got nothing to get it to the next stage.
5 STALL reps · all in final quarter of session · fatigue signal in the data
If I go out and I put off the rubber and I stop here and then I start to rotate — guess what: I've lost everything that I tried to create here. If I stop between strides and I stop between the arm and the hip and the shoulder — everything has to restart and that just takes all of the momentum out of the delivery.
Focus style to velocity. Without any pauses or hesitation, just smooth — one complete, one smooth process. The transition goes from the hands dropping to the elbows lifting, separating and then into the throw itself. Connection is important because it drives a whipping arm connection for his momentum — focus on the velocity output, not the movement shape.
Staying on top of the ball
Anytime you see that ball spinning the other way, like a slider or a curve ball, that is when you know the kid's fingers are not staying on top of the ball. That's when a player drops a little bit underneath and the ball instead of getting that good sink and angle on the ball just flattens out and stays pretty much on one plane. Many kids don't even know they're doing it.
The metric IS the drill. The easiest way to figure out if a kid is doing that is his ball will almost come out of his hand and spin like this on its way to the target — almost like a little bit of a curve or a ball that's certainly not spinning like a fastball, which would be more 12 to six. The sensor feedback is the fix McCreary prescribes: external read of spin direction. The kid can't self-diagnose. They need feedback they can see.
Gyro X-axis sign-flip timing relative to release timestamp. BEHIND ≥10ms = clean four-seam. AT ±10ms = cutter action. EARLY ≥10ms = slider spin — fingers came off the side.
"Your fingers stayed on top — clean fastball grip. On 4 reps this session, they came off the side early. That's the slider spin Coach McCreary flags."
Same fingerprint surface works for football QBs (spiral vs. wobble) and softball (wrist-snap confirmation). One metric, three sports.
There really is no such thing as perfect mechanics. Anytime I'm doing a breakdown I'm not comparing these guys to this one gold standard.
Just realizing it's much harder to actually fix the problem than simply identify a problem. I'm not comparing these guys to this one gold standard — what I'm doing is looking through a framework but understanding there's a huge range of variation that occurs within this. There's a time and a place for tinkering with mechanics and there's a time when the mechanics are in a really good spot.
Jacob deGrom — he really just said: "I've been focusing on using my existing patterns and being as smooth as possible." Billy Wagner talked about how hard can I throw this ball with as little effort as possible? Compare the kid to themselves, not to a gold standard. The drift score IS the intervention — it tells you whether today's session moved toward their personal baseline or away from it.
Throw the absolute crap out of the ball.
There is a transformer effect in pure rotation — when one body segment connects with the other, you don't get a whip effect per se, you get a transformation effect. This portion of the trunk is largely due to muscular action picking up each segment at its highest velocity. This is critical to understand.
The main issue, the easiest 10 miles an hour he will ever gain, is from putting on 30 pounds and adding a significant amount of strength. Look at the lifting thresholds — mid-400s deadlift, mid-300s squat, around 100-pound dumbbells in dumbbell bench press. Getting to some of those just baseline strength numbers while putting on about 20–25 pounds — there's a high probability that's going to be the unlock you're looking for.
For youth pitchers, the big thing is simplicity. No extraneous movement.
Keep it simple. A lot of times I see pitchers who have a lot of movement and that is going to throw off my rhythm and my tempo and make my release different every time. No extraneous movement — head and center-of-mass stability is the anchor. Every mechanical flaw in youth pitchers traces to unnecessary movement of the head and center of mass.
Lead with your hip, not your shoulder. Arm's width from a wall or fence, palm flat, arm straight. Lift kick leg, slide laterally — NOT rotating — hold, return. The knee can angle slightly back but the body stays mostly sideways. Two steps: wall-assisted first, then free-standing. Knock your knees from the stretch naturally triggers the hip-lead motion without requiring the player to understand it conceptually.
We don't want to teach young pitchers to throw darts to aim. Those are not good habits. They're not sustainable habits.
There is a time and a place for tinkering with mechanics and there is a time when the mechanics are in a really good spot. There's so much more that goes into performance than just mechanics — conditioning, nutrition recovery including sleep, strength and conditioning. Workload isn't a score to chase. It's a check-in.
Throw the absolute crap out of the ball. When the dial hits amber — easy day before tournament. Red means rest. Built so coaches act, parents don't worry. If velocity concern shows up, route to a mechanical checkpoint. Never tell a young pitcher to aim it or take something off. Accuracy is a downstream outcome of mechanics, not an input.
The elbows are lifting, the elbows are lifting — continuous action, not a discrete event.
Scapular loading begins with handbrake. We're not breaking the hands — what we're doing is we're using the elbows. Once the hands separate the elbows don't drop any further than what you see here. Any pause or hesitation between the hands falling and the elbows lifting kills this loading. The process of handbrake — allowing gravity to work for you, let the hands draw — without any pauses. That's a key element: without any pauses or hesitation.
Without any pauses or hesitation, just smooth — one complete, one smooth process. The transition goes from the hands dropping to the elbows lifting, separating and then into the throw itself. Let the hands fall — don't push them down. Elbows lift at break — hands come apart as a result. No stops. One smooth chain from hands-high to release.
If you can't slow it down, you don't have the body awareness you need to make changes to your arm circle at game speed.
I find that a lot of pitchers can't really go in slow motion. They have to be going at full speed all the time. The slower I move, the more I have to feel my muscles. That's why everybody wants to go at 100% — because they don't have to feel things as much. Staying really relaxed, not tense. A tense arm produces uneven angular velocity and reduced arc radius.
Just a simple relax through arm circles as I get through my pitch — staying really relaxed, not tense. Back up just a few feet in front of the pitching rubber, after spin work. First 10–15 pitches: arm circles at 20–30% intensity, deliberately slow, minimal lower-half engagement. Then add: pushing down with my right foot and getting up on my toe, thinking about my drag, my back knee coming towards my front knee. Still ending with balance, not falling over my front foot.
Anytime you see that ball spinning the other way — that is when you know the kid's fingers are not staying on top of the ball.
Some kids throw what is called a natural slider. When they throw a baseball, their fingers generally come on the side of the ball instead of staying directly behind the baseball. Many kids don't even know they're doing it.
The easiest way to figure out if a kid is doing that is his ball will almost come out of his hand and spin like this on its way to the target — almost like a little bit of a curve or a ball that's certainly not spinning like a fastball, which would be more 12 to six. Roll the session's pronation classes up: fastball day or slider day, at a glance.
The elbows are lifting, the elbows are lifting — continuous action, not a discrete event.
Scapular loading begins with handbrake. Any hesitation between the hands falling and the elbows lifting zeros gravitational momentum. What's the value of my M when I come to the stop? Zero. Zero. So I've got nothing to get it to the next stage.
Without any pauses or hesitation, just smooth — one complete, one smooth process. The transition goes from the hands dropping to the elbows lifting, separating and then into the throw itself. One filter on existing tempo + peak_dps fields surfaces every rep where the kid paused mid-delivery. Zero new code.
We don't want to teach young pitchers to throw darts to aim. Those are not good habits. They're not sustainable habits.
Aiming produces neither accuracy nor arm health — it creates muscle-memory for a diminished, tense motion. Coaching feedback should never suggest 'aim it' or 'take something off.' If a kid is missing the zone, the prompt should be about a mechanical checkpoint, not about intent.
Throw the absolute crap out of the ball. Focus style to velocity — direct all athletic focus toward velocity output, not movement shape. We can already see when they took something off. The rep is flagged. The fix is one cue: stop aiming, let the mechanics do the work.
9 metrics. 6 coaches. 71 verbatim cues. One wristband.
Every score in Statterbox traces to a real coach who teaches it on YouTube — and we're aligned with their teaching, not against it. When a kid sees a coaching cue in the app, they're reading the same words Brewster uses with his college pitchers, the same words McCreary uses in his youth clinics, the same words Scarborough teaches to competitive softball programs. The wristband measures what the coaches already see. The app says what the coaches already say.
independently name Elbow In Plane as the biggest velocity limiter
converge on max-intent throwing — none say aim, all say throw hard
Money 7 momentum trough found clean in 91 of 97 real pitching reps
What we measure.
What we don't.
Every wearable on the market makes claims it can't back up. We won't. Here is the line — drawn before we ship a single band — between what the sensor is actually capable of and what it is not.
- ✓Motion patterns
How the wrist moves through a rep. Loading phase, peak rotation, deceleration shape, rep-to-rep similarity.
- ✓Self-baseline trends
Your kid's April pattern vs their May pattern. The trend is the signal — not any single rep.
- ✓Workload counts
Total throws, swings, kicks across sessions and seasons. The cumulative volume that matters for safety.
- ✓Cadence + consistency
Inter-event timing, variance across reps, session-end fade. The shape of practice, not the score.
- ✗Exact pitch velocity (mph)
We can't measure ball speed from the wrist. Radar measures ball speed. We measure arm motion.
- ✗Bat exit velocity
The bat moves; we're on the wrist. HitTrax in the cage measures bat speed. We don't.
- ✗Joint angles or biomechanics
We don't reconstruct the body. No knee flex, no hip-shoulder separation, no kinetic chain claims.
- ✗Injury risk scores
A single-wrist sensor cannot quantify joint torque. We surface workload zones. A doctor diagnoses injury.
We grade motion. We don't claim radar-grade velocity.
Your kid is compared to their own April — not someone else's average.
One bad swing doesn't change anything. Three weeks of slipping does.
Honest data is the only data Aaron and Emily wanted to coach with. So that's the only data we collect. If we can't measure it cleanly, we don't claim it.
Same kid. Same wrist.
Four sports, four release styles.
May 5, 2026 · Rich walks onto a field with one Apple Watch and runs through a football throw drill, three baseball drills, and a softball pitch. The pipeline picks up his release style on each one. No competitor on the market can show this on one band.
Finish every long throw with a wrist snap
Three days ago his release was loose. Today it locked in.
If your kid trends toward looser mechanics across sessions, you see it the same week. If they hold tight for three weeks, the rep budget is paying off — and that's visible. That's why parents stay subscribed.
Field sessions aren't a silo. Between throws Rich walked to the net, fetched balls, set up. The watch sees motion either way — so we filter for the wrist signature of an actual throw (high peak G, fast wrist whip) and report that count. Multi-phase reps like the catcher's catch + exchange + throw collapse to one rep. Walking and setup motion drop out. The number you see is signal, not totals.
Five features.
All five proven on real data.
Three days, eleven baseball sessions, two of them with synced video. The numbers below are straight pipeline output from real wrist-IMU sessions Rich captured at the cage and on the mound.
Eleven events. Bucketed automatically. Watch the brakes fail.
Every bar is an event the sensor caught. Bar height = peak G. Color = bucket the classifier put it in. Notice the four max-effort throws (12s, 21s, 33s, 59s) — then the late reps drop into the medium bucket as the arm fatigues. No human labeled any of this. The pipeline did it from the raw IMU stream.
- · 3× Rich wall hits
- · Kid A baseball — 58 swings
- · Kid B baseball — 67 swings
- · Rich throws — 30 events
- · Rich batting — 28 hits 🎥
- · Rich pitching — 19 throws 🎥
- · 2× warmup pitching + batting
- · Rich batting fresh — 35 hits
Each feature has a coaching claim, a peer-reviewed signal grade, and a measured number from an actual session. None are projections. The code already runs.
“Their swing path is 97% repeatable rep-to-rep.”
Cosine similarity of every rep-pair in a session. Pure math, no black box.
“By rep five the brakes were already fading.”
Compare early-session reps to late-session reps. The arm gets weaker, slower, sloppier. The sensor sees it before the kid does.
“Kid B's swing is 8.5× more compact than Kid A's.”
Time from swing-start to peak rotation. Universally taught. Never measured rep-by-rep in a consumer product. Until now.
“47 swings, 53 throws, 12 catches detected — automatically.”
See the hero chart at the top of this section — that's the classifier output for Rich's pitching session. No human labeled any of those eleven bars. Same logic ran on every session below.
Effort buckets emerge from peak G + gyro thresholds.
Same classifier learns batting buckets from training.
The pitch-count + workload layer is real today.
“Rhythmic. Or chaotic. The cadence is the signal.”
Inter-event intervals. A coach knows by ear when a kid is locked in. The sensor knows by CV (coefficient of variation).
Three skill tiers, three different bodies, same wrist sensor. Distinguished without any tuning, calibration, or sport-specific algorithm.
The coaching app you see in the screens above is what we will build. The numbers that app will show are real today. The sensor already discriminates skill, catches fatigue, counts reps, classifies events, and reads cadence. We're building the layer that makes it visible to coaches and parents.
What it means when
your kid's coach
has the data.
Every coach your kid has ever had was working from gut, clipboard, and whatever they could hold in their head after watching twelve kids at once. That coach cares. They're just missing the one thing that would let them act on what they already suspect — a name, a number, and the data to back up the conversation they already knew they needed to have.
Now practice ends and the data's already there. Who had a flag session. Who improved. Who's near their weekly cap. They open the app, not a legal pad. By the time you've pulled out of the parking lot, your session report is already on your phone. Your kid gets the coach they deserve.
"I don't need a chart. I need to know which kid to talk to next."
Drift detected. Drill assigned. Kid notified before they leave the field. No clipboard. No follow-up text.
Practice ends. Twelve parent summaries auto-route. You text nobody. The team chat does it for you.
March through November — every trend, every load spike, every improvement. You walk in with evidence, not instinct.
Loading-phase 30ms slower than their 3-week average. Same on Tuesday.
Open the app. Every kid's session is already there — who flagged, who improved, who's on workload watch. Twelve kids reviewed in under five minutes. Pruitt's loading phase is slipping: assign him 15 reps of tee work before Saturday. He gets the notification before he leaves the field.
First time a coach has had any data at all — and a direct line from the data to the next drill.
Twelve session reports auto-route to twelve sets of parents. You text nobody. The team chat does it for you.
No more "great practice!" texts you don't believe yourself.
The week summary writes itself. Three kids on workload watch. Two new badges. Pull up. Forward. Done.
No spreadsheet. No memory game. No Sunday-night unpaid hour.
Pull up any kid's full arc — March through November. Every mechanic trend. Every load spike. Every improvement. You walk into the parent meeting with evidence, not instinct.
The season portfolio changes the conversation with parents completely.
Three things.
Not a wall of stats.
Every parent app on the market drops you into a dashboard with eight charts and zero answers. We don't. The drive-home push is structured the way a parent's brain actually works:
The wins. The gains since April. The thing the lessons are paying off on. Two bullets max.
The drift, the workload zone, the one thing that needs a check-in. Soft language — never "at risk."
The drill the coach assigned. The rest day. The texts auto-routed to the other coach. Concrete next moves.
"Separate it into what improved, what to watch, and what to do. That's how a parent actually wants information. And the language matters — \"check in\" empowers a coach, \"at risk\" scares a parent."
Three things. Plain language. On the drive home. Every practice.
The kid wants it
before the parent does.
That's the plan.
Every wearable for kids dies because the kid doesn't care. We solved that with three things: a wrist that buzzes for every PR, a leaderboard that resets every Sunday, and a tier ladder they can climb by reps — not by buying anything.
Bronze → Silver → Gold → Elite. Can't be bought. Doesn't reset because someone new joined. Pruitt is currently Gold — 3 more PRs to Elite.
"Two kids will start talking about it at practice and the others are like — wait, I need this to prove I have the fastest swing."
Marcus earns "Most Compact Swing" Sunday night.
Aaron screenshots the badge into the team group chat.
Your kid sees it at breakfast Monday.
Tuesday practice: "Dad, can I get one of those bands?"
$50. Done. Now they have the data — and Marcus can't ignore them.
They aren't competing
against the data alone.
Kids on the same team already compete every practice. We make that competition visible, fair, and real-numbered. Friends. Head-to-head. Team badges. Coach-triggered weekly challenges. Every loop drives one kid to ask their parent for a band — or a teammate to keep wearing theirs.
Friend feed shows PR moments live. Each one is a small dopamine hit + a small social proof. Kids who don't have a band see what they're missing.
Friends-of-friends ask their parents Tuesday morning.
Two kids, one number, 48 hours. Closed loop, immediate stakes. Reps go up, retention goes up, the band goes on every practice this week.
Beaten kid wants their own band to even the score.
Aaron picks the metric (Consistency 95+, longest streak, fastest snap-and-throw). Whole team plays. Whole team gets a team badge if they hit the threshold.
Team badge means kids without bands feel left out — by name, in the group chat.
Every loop drives a single behavior: one more kid asks their parent for the band. The Season Card sells the product to strangers. The friend, duel, and coach loops sell it to teammates.
We don't sell a band.
We sell their Season Card.
Every kid in the cohort, end of season, gets a verified digital athletic card. Real stats — repeatability, compactness, total reps, how they grew against their own April baseline. Designed to be screenshotted. Designed to be posted. Designed to be the kid's first real piece of athletic identity.
The wearable is the data-collection layer. The Season Card is the artifact parents share. Every shared card is a free customer for the next cohort.
Posts Lila's Season Card to Instagram on the last Saturday of the season.
Real number. Beautifully designed. Tagged with the year. Their kid, verified.
Sees it scrolling on Sunday morning. Comments: "What is this???"
Their kid plays travel baseball too. They've never had anything like this.
Three texts and one DM later, that family signs up.
Free CAC. The card sells the band. The band feeds the next card.
Auto-generated weekly scorecards.
A small Season Card every week — for 52 weeks.
The week's average across Mechanics, Power, Consistency, Endurance.
The single biggest jump — what to celebrate Sunday night.
What the coach builds drills around for the coming week.
Auto-routed to coach + parent every Sunday at 8 PM. Shareable. Stackable. The 52-week collection becomes the Season Card at year's end.
$50 for a band is a band. $50 for your kid's first real verified Season Card every year — that's a tradition you start now and keep until they age out.
Every founding-cohort card is serial #001 – #100. The first hundred kids ever to have one. Not a marketing gimmick — an actual collectible artifact tied to the product's origin.
Coaches got real-time alerts. Parents got drive-home pushes. Kids got leaderboards. The card is what the season builds toward. And the next cohort is what the card builds toward.
Bat sensors die
in October.
We don't.
Every single-sport tracker on the market loses your kid the moment they pick up a different ball. The bat sensor goes in a drawer. The kicker sensor never sees them swing.
We follow them. Same band, same ID, same year-long story. By month three, a coach can say things no other product can say.
Cross-sport coverage is not a feature. It is the entire business. Anyone catching up has to start the year-long calendar over from scratch.
Softball
- · windmill release timing
- · pitch count
- · swing compactness
- · weekly workload
Baseball
- · swing tempo
- · load timing
- · throw count
- · weekly workload
Football
- · snap-and-throw
- · catch impact
- · drop-back tempo
- · session load
Soccer (year-round)
- · kick approach
- · sprint cadence
- · session load
- · leg asymmetry
These insights require a full year of multi-sport data. The founding cohort is year one.
"Their baseball swing hasn't lost any tempo since July — football season hasn't dragged it."
"Their throwing arm carried 340 pitches from April to July, then went straight into 60 snaps a practice in August. We flagged it. They're fine."
"Their fall football compactness mirrors the gain made in summer baseball — same body learned both."
"Their weekly load is 22% above their February baseline. Pull back this week or the tournament will pull back for you."
Not "fitness tracker."
Every position. Every sport.
Generic fitness wearables hand you steps, heart rate, and a score that means nothing in your sport. We hand you the specifics that match the position your kid plays — shortstop, linebacker, forward, catcher — on the day they play it.
Throwing mechanics + swing compactness, every rep
Pitchers, catchers, infielders, batters. Loading phase, arm slot, pop time, swing compactness. Not just the pitcher on a pitch count — every kid making throws at practice has data worth collecting.
Hand-fighting + release mechanics
QB drop-back tempo. WR catch impact. LB shedding blocks. DB jamming. The 80% of the roster that isn't the kicker — finally has data.
Kick approach + sprint cadence
Band on the ankle, not the wrist. Approach tempo, follow-through arc, work:rest ratio. The 80-minute kid vs the 40-minute kid — distinguishable from minute one.
Cumulative arm load · April through November
One arm. Three sports. Two coaches who never spoke to each other. The band is the only thing that sees the total throwing load from baseball through fall football. When the arm carries too much across seasons, we see it before it reports.
Pitch Smart, automated.
For every coach and every parent.
USA Baseball mandates pitch count limits by age — 50 per outing for a 10U pitcher, 75 for 12U, 95 for 14U, with required rest days that scale with workload. Every coach knows the rule. Most can't actually track it across a tournament weekend with five teams on five fields.
The band counts every pitch. Live during the game. Across every team your kid plays for. Coach gets a soft warning at 80% of the limit. Parent gets a heads-up before the kid steps back on the mound. Hard rule violations get flagged for the league.
If you've ever counted pitches in a notebook between innings while also coaching third base, you know exactly why this exists.
13 pitches to limit. Soft warning at 60.
Cannot pitch in another league game until Tuesday.
Travel coach, school coach, and parent all see the same number. No one accidentally pitches them on a rest day.
Three games Saturday. Two Sunday. We track all five.
Travel-ball workload doesn't fit in a single-game tracker. We aggregate the whole weekend, alert you when a kid's hit a personal cap, and produce a Monday-morning recap a coach can actually use to plan the week.
They had a sore arm Tuesday. Show the curve back.
Mechanics drift, loading time, deceleration — all tracked against their pre-injury baseline. You see the numbers come back, day by day. Real evidence to show the parents (and yourself) before you put them on the mound again.
Two kids. Two sports. One app.
Lila plays softball Tuesday and soccer Saturday. Her brother Pruitt is travel baseball + flag football. Same parent app. One pane of glass for the whole household.
The drill recommender.
When the band detects loading drift on a kid, the app suggests three specific drills proven to fix that pattern. Not just diagnosis — prescription. V1 feature, coming online once cohort feedback locks the drill library.
Ready · Check in · Pull back.
Every morning, the app reads the prior session's workload and mechanics drift to set a readiness status. Green means go. Amber means go light. Red means rest and here's why. Coaches plan practice differently when they know three kids are in "check in" before warmup.
The algorithm miscounts. Coaches catch it.
A coach can flag a false rep, reclassify a motion (swing miscounted as throw), or mark a full session as a bad-data capture. That flag trains the model. Every override makes the next session more accurate. The technical name is RLHF — the coach's name for it is "finally, someone listens."
Practice ≠ private lesson ≠ free training.
Session type is selected at the start of every session. A 50-pitch private lesson and a 50-pitch scrimmage are different loads — the context tag changes how we frame the workload number and what we compare it against. Available at V0 launch.
Hardware policy.
No surprises.
Rated for practice and games. Goes through a full summer of softball without an issue. Not rated for the pool — take it off before swimming.
Band fails on its own (battery, sensor, button) — that's on us. The kid's profile, scores, streaks, and Season Card progress live in the cloud, not on the device — none of that is at risk if a band has to be swapped. Final warranty + replacement details ship with V1 hardware, before the founding cohort goes live.
One full practice or one tournament day. Charges to full in 90 minutes via USB-C. Most cohort families charge it weekly.
Same band for baseball + football + soccer. Move it from wrist to ankle for soccer. The profile follows the kid, not the sport.
Whatever they did from age 11 to age 18 is theirs — exportable, portable, no lock-in. The Season Cards don't disappear if they cancel.
Who can see what.
No surprises.
Parent owns the profile. Coach sees the workload. Kid sees the leaderboard. Every access decision is parent-controlled — and cross-team visibility is the point, not an oversight.
Can the baseball coach see the football season data?
Youth data privacy: Parent owns the profile. Team-only visibility — no public athlete records, no location sharing. Data is never sold. COPPA compliance is built into the architecture, not bolted on. Your kid's record is theirs, exportable, at any age.
The window closes.
Most parents don't see it go.
Ages 7 to 14 are the years when athletic motor patterns are built — or built wrong. What you catch in this window matters. What you miss sticks.
of Tommy John surgeries are on athletes ages 15–19. The damage starts ages 9–14.
The injury that felt sudden
It never is. Overuse injuries have a 6-to-12 week runway — mechanics drifting, load accumulating, deceleration weakening rep by rep. The pain is the moment the body ran out of compensation room. Without cross-sport tracking, that runway is invisible.
of youth sports injuries are overuse — not acute accidents. Preventable.
The plateau nobody can explain
Three years of practice, two coaches, $6,000 in club fees — and their swing hasn't measurably changed in 18 months. Not because they aren't working. Because nobody has a baseline to measure against.
overuse injury rate in single-sport year-round athletes vs. balanced multi-sport.
The cross-sport collision
"The soccer season ends Saturday. Football conditioning starts Monday. We're crossing our fingers." Their coaches don't talk to each other. Neither dataset connects. Your kid's body is the only thing that sees the combined load — and it communicates in pain, not data.
Pull any moment from a youth-sports calendar. The data either exists or it doesn't. The difference is the rest of their athletic life.
68 pitches Saturday felt fine. 54 more Sunday felt fine. Soreness shows up week 3 of August football.
Pitch count auto-tracked. Soft warning at 80%. Coach assigns rest before football conditioning starts.
Same arm. Different jersey. New coach who never spoke to the baseball coach. The arm carries July's load into 60 throws a practice.
Cross-season workload visible to both coaches. "Last week was a 340-pitch month. Easy day Tuesday."
"They're working hard, just hasn't clicked." $100/hour lessons keep getting scheduled. No baseline to validate.
Mechanics consistency 78% → 92% over 6 weeks. The lessons ARE working. Or they're not — the data tells you which.
Kid says fine because they want to play. Parent gives ibuprofen. Three weeks later: scan, surgery, season.
Loading-phase drift detected 11 days before pain. Coach pulls the kid. Two weeks of rest. Season saved.
"We didn't know" is the most expensive sentence in youth sports. You are not going to say it.
The founding cohort is 100 families. At $50, it is the clearest development record you will have all season. The development clock is already running.
Where this goes.
The five-year arc.
The founding cohort isn't the product. It's the proof. What we're actually building — if we execute — is the first verified athletic development record that follows a kid from age 8 to age 18 across every sport they play. That record becomes the artifact that exists nowhere else in youth sports.
Prove the sensor. Prove the story.
100 founding-cohort kids. Four sports. Fall football preseason as the proving ground. We don't need the whole market — we need Aaron's network to say "this changed how I coach" and Emily's network to say "this is the first thing that actually tracked my kid's arm all season." That quote, from those people, unlocks everything after it.
- →Pitch count + cross-team arm load tracking validated
- →Cross-sport fingerprint built for each founding kid
- →Season Card shipped as a real artifact at end of year
- →Enough data to train the proprietary classification model
The longitudinal moat kicks in.
By year three, the kid who started at 11 has three seasons of data. Their baseball throwing mechanics, their fall-football arm load, their soccer-season hip mobility — all on one timeline. No other product in the world has that. Not because we're smarter. Because we were the only ones who put the same sensor on the same kid across multiple sports for multiple years and kept the profile intact.
- →Multi-season cross-sport timelines drive retention
- →Coach Override + RLHF loops sharpen the classifier per sport
- →Season Card becomes a high-school athlete's primary record
- →Recruiting inquiry surface opens — not pitching it, responding to it
The discovery platform.
NCSA has highlight videos. Hudl has game film. Nobody has biometric proof of development trajectory. A scout watching a 15-year-old doesn't know if that kid has been overthrowing for three seasons or just peaked. We do. The Season Card is the resume. The longitudinal record is the reference letter. At scale, this is the data layer youth sports recruiting doesn't know it's missing yet.
- →Season Card opt-in sharing with coaches, scouts, recruiting platforms
- →Verified development trajectory — not self-reported stats
- →The first youth sports platform where the data follows the kid through high school
- →Cross-team workload graphs become the standard due-diligence tool for any coach inheriting an athlete
"The LinkedIn for youth sports doesn't exist yet."
LinkedIn works because it follows the professional across companies. The Season Card works because it follows the athlete across teams, sports, and years — independent of which jersey they're wearing. That portability is the moat.
The hardware is finally cheap enough to be disposable.
WHOOP proved parents and athletes will pay for biometric data. Apple Watch proved the wrist is a viable data capture point. What neither of them did was build a classifier that understands the difference between a QB drop-back and a defensive tackle's hand-fight — because they weren't trying to. We are. The IMU is commoditized. The sport-specific classification layer is the work. That's where the moat is.
Aaron's network is the distribution. The FoilBear pipeline is the stack.
We don't need to go cold. Aaron is a youth football coach with three multi-sport kids and a network of other coaches who will take his call. Emily's circle is the parent-community validation. The FoilBear BLE + IMU pipeline already runs in production — we're not starting from scratch on the sensor stack. The founding advantage is real, and it's specific to these two people.
Three seasons of cross-sport data on one kid is irreproducible.
A competitor can build a better sensor. They cannot rebuild a longitudinal dataset of youth athletes who wore the band through baseball AND football AND soccer AND stayed on the platform. Retention isn't just a revenue metric — it's the data flywheel that makes the classifier proprietary. Year-three data makes year-one data more valuable. That compounds.
PickleBear-class product = $3–5M. This = $50M+ if the moat materializes.
Single-sport wearable is a fine business. Multi-sport longitudinal platform with a proprietary classifier trained on cross-sport youth data is a different category. The thesis pre-validated on the founding call — Aaron and Emily articulated "compare 5yo to high school" before it was even pitched. That's the customer telling you what they'd pay for before you ask.
Custom PCB (nRF52840 + ICM-42688-P) is 10–15 weeks. Miss the fall football preseason window and the founding cohort story slips a full year. This is the critical path.
Compliance follows motivation — the thesis is that the leaderboard and Season Card make kids want it on. This is unproven. The V0 cohort is the test. We don't hand-wave this risk.
Cross-sport classification (QB throw vs. WR route run vs. defensive rep) has to be accurate enough that coaches trust the rep count. Coach Override is the feedback loop. If the model doesn't improve fast enough, the coaching story falls apart.
The market just consolidated
around the swing.
We're building something else.
In May 2026, WIN Reality acquired Blast Motion — combining VR batting training with 500M+ swing records into a single premium hitting bundle. It's a meaningful deal. It validates that parents will pay real money for youth sports sensor data. What it also clarifies: the market's best products go very deep on one motion, for one sport, in one setting. Statterbox is a different bet — one kid, every sport, every season.
| Dimension | Hitting specialist WIN Reality + Blast Motion | Throwing specialist PULSE / Motus throwSleeve | General wearable Apple Watch / WHOOP | Multi-sport platform Statterbox |
|---|---|---|---|---|
| Sports covered | Baseball / softball hitting | Baseball / softball pitching | All (fitness-level tracking) | Baseball · Softball · Football · Soccer (V0) |
| What it measures | Bat speed, swing path, attack angle, time-to-contact | Arm slot, arm speed, elbow stress (acute load) | HR, steps, sleep, generic activity — not mechanics | 9 Money tiers: pronation timing, mechanics, power, consistency, workload, elbow plane, momentum continuity |
| Where it lives | Batting cage, gym, indoors | Bullpen, field practice | Everywhere — wrist 24/7 | Every practice · every field · every season |
| Multi-sport · one kid | — | — | Partial | ✓ |
| Cross-season record | — | — | Partial | ✓ |
| Cost · year 1 | ~$150–200 (sensor) · $1,000+ (VR bundle) | ~$200–300/year | $200–500 hardware · up to $30/mo (WHOOP) | $50 founding / $89–179/year post-launch |
| Best for | Dedicated hitters who want cage-proven swing data | Serious pitchers managing arm load and injury risk | Overall fitness awareness — not sport-specific coaching | Multi-sport kids and the parents tracking their whole development arc |
| In a line | “500M swing records on bats. Deep on one motion.” | “Built for pitchers managing arm load. One sport, one motion.” | “Tracks the kid's pulse. Doesn't know they're throwing.” | “Every motion the kid makes on every field they play on.” |
“500M swing records on bats. Deep on one motion.”
“Built for pitchers managing arm load. One sport, one motion.”
“Tracks the kid's pulse. Doesn't know they're throwing.”
“Every motion the kid makes on every field they play on.”
Single-motion sensors and VR cages answer one question well: how good is the swing right now? Statterbox answers a different question: who is this kid becoming as an athlete — across everything they do, over years? Both are real questions. They serve different parents. A family with a single-sport travel commitment and a cage subscription already has a great option. A family with a kid who plays baseball in spring, football in fall, and soccer year-round — following that kid across all of it — that's who we're for.
Questions.
Answered.
What ages is this designed for?
The developmental window we're targeting is ages 7–14 — the years when athletic motor patterns form. If your kid is 8 and plays rec baseball, the band fits and the data is useful. If they're 14 and multi-sport, the cross-season longitudinal story is already building. The founding cohort is focused on youth through early high school.
My kid plays baseball AND soccer. Do they need two different bands?
One band. The same band that tracks their baseball throwing arm in April sits on the kicking-leg ankle strap in September for soccer. The app knows which sport they're in based on the mounting point selected at the start of a session. One device, one profile, one year-long story.
Their travel baseball coach and school team coach have never spoken. Can both see the data?
Yes, and that's the whole point. Your kid's throwing arm doesn't care which jersey they're wearing. Both coaches see the same cumulative pitch count, the same workload number, the same loading trends. When the travel coach knows the school season just ended with 68 pitches on Saturday, August conditioning goes differently. The band is the only thing in the system that sees both.
Will it actually get in the way? Will they wear it?
The band sits on the throwing-hand wrist — above the glove line for fielding, above the grip line for batting. For kickers and soccer players it mounts on the ankle. We designed it to be forgotten between reps. The V0 cohort is the compliance test. Our thesis: the leaderboard makes them want it on. Compliance follows motivation.
What does the subscription cost after the first 6 months?
Not locked in yet — and that's honest. The founding cohort is how we calibrate what the data is worth to real families. Founding members lock the lowest price we will ever charge, for the life of the product. You're paying $50 for the hardware and getting 6 months to tell us what you'd pay to keep it.
We have two kids in two different sports. Do we need two bands?
Yes, one band per kid. Each band belongs to one athlete profile — that's how the individual baseline and the cross-sport longitudinal story get built. The parent app shows both kids on the same dashboard. You manage two profiles from one screen.
What if my kid quits one sport mid-season?
Nothing breaks. The band keeps tracking whatever sports they're still playing. The data from the sport they left stays in the historical record — which is actually valuable for cross-season comparison when they pick it back up next year. The profile is cumulative.
Is this just for throwing sports, or does it track kickers and soccer too?
Both wrist and ankle placement are in the V0 launch. Football kickers and punters wear the band on the kicking-leg ankle. Soccer players do the same. The IMU captures kick approach tempo and follow-through signature distinctly from throwing mechanics — the classifier knows the difference. The Specifics section earlier on this page has the position-by-position breakdown.
Is it waterproof?
Splash + sweat proof. Rated for practice, games, rain delays, and a full summer of softball without an issue. Not rated for swimming pools — take it off before they jump in. We optimize for the field, not the pool.
What if it just breaks on its own?
Hardware defects (battery, sensor, button) — we replace it free. We're shipping a piece of equipment, not a phone — if our band fails on its own, that's our problem. If a kid threw it across the dugout, that's the lost-band policy. Both paths get you a working band; the only difference is who's responsible.
Does the band give my kid feedback while they're playing?
The band is a sealed coin sensor — no screen, no scoring LED, no haptic feedback. It's a purpose-built collector. All scoring and feedback live at the apps. The coach's phone (in their pocket) gets a live drift flag if BLE-connected during practice. The parent's phone gets a PR push as the band syncs. The kid sees their reveal on their phone seconds after taking the band off. We're not putting compute on the band. Ever. The apps stay the smart layer so they can update weekly — instead of the hardware shipping a firmware fix once a year. Cheap band, smart apps, indefinite product velocity.
What does "check in" mean instead of "at risk"?
Word choice. We chose softer language on purpose. "Yellow zone — check in" is what a coach can do. "At risk" is what a parent panics about. The data doesn't change. The framing does. Coaches deserve actionable guidance; parents don't deserve to be scared by a yellow bar on a chart.
Can the app know if it's practice, a private lesson, or free training?
Yes — session type is selected at the start of every session: practice, private lesson, clinic, or free training. The distinction matters for workload tracking. A private lesson is high-intensity, coach-directed, often shorter in reps but higher in quality focus. A free training session is self-paced, higher rep volume, lower intensity. The band captures the same mechanics data either way, but the context tag changes how we frame the workload number and what we compare it against. A 50-pitch private lesson isn't the same load as a 50-pitch scrimmage.
Your kid.
Not a wait list.
One hundred kids who actually wear the band — in real practices, real games, real seasons. Every family selected by a founding coach who knows their kid. Not a public lottery. Not a Kickstarter waitlist that never ships.
- · Sensor band (wrist)
- · Ankle strap (soccer / kicker)
- · Charging cable + caddy
- · Coach + Parent + Kid apps
- · One free replacement / year
- · Multi-sport families (2+ sports per year)
- · Parents writing $3K+ in club checks without a way to measure what's working
- · Families who can commit the full season — the year-long story requires the year
Season Card serial #001 – #100. Permanent collectible.
Founding pricing locked for life of product.
Direct line to product team — your feedback shapes V1.
Tell us your kid's sport and age. We'll be in touch.