Athlete Protection Technology

One athlete. Multiple teams. One workload.

Club on Saturday, a tournament on Sunday, school or Little League during the week — each coach sees only their piece. DiamondKeeper adds up a pitcher's counts and required rest across every team, so the family and the coaches see the whole arm.

Open the app See how it works

Built for youth baseball pitchers — softball supported too. Informational workload tracking — not medical advice.

DiamondKeeper cross-team arm check: each pitcher's pitches by team, the date their rest ends, total throws, and a flag for kids on two teams in 30 days

Cross-team arm check. (Sample teams and made-up players.)

We track the player, not just the game

A pitcher's arm doesn't know which team the pitches were for — it feels the total. Three steps, and it builds as you score.

1

Set the age

Pick the pitch-count age once, so the rest days match your level (Pitch Smart guidance).

2

Score the game

Pitches count themselves while you keep score. Add warm-ups, and mark if the kid also caught or played a heavy-throw position.

3

Check the Arm tab

Every player shows available, thrown today, or needs rest — with the date their rest ends.

🧩 Every team, one count

Turn on arm care and sync your roster — the rest math then pools across every team a kid pitches for. That's the part single-team apps miss.

  • Outings from each team the player is on, in one list
  • The date each pitcher's required rest ends
  • A flag when a kid pitched for two teams in 30 days — Pitch Smart advises against pitching for teams with overlapping schedules
  • Pitched somewhere that doesn't use DiamondKeeper? Log an outside outing or bullpen
Roster status today: three pitchers need rest until a set date, two are on two teams in 30 days, two are available

🧢 Beyond the pitch count

Warm-ups, bullpens and throws between innings are real work for the arm — and they never show up in a pitch count. DiamondKeeper estimates the full arm load.

  • Total throws today, not just counted pitches
  • Warm-up and bullpen pitches with one tap
  • Between-innings throws counted from the outs you record
  • Mark "also caught" or a heavy-throw position (SS / OF / 3B)
Full arm load card: about 36 total throws today from 11 counted pitches plus 25 warm-up pitches

🩺 Fatigue Watch and "How's the arm?"

Pitch counts alone can miss a tiring arm. Log a few pitch speeds and Fatigue Watch flags a velocity drop during the game.

  • A 5-second check-in: Fresh, Normal, Tired or Sore
  • Arm readiness at a glance on the scoring screen
  • Any pain or soreness that doesn't go away: see a qualified medical professional
Fatigue Watch card and Arm readiness card showing Ready, with a How's the arm? check-in: Fresh, Normal, Tired, Sore

🏟️ For coaches and leagues

Arm care sits on every team page, and leagues get the whole picture.

  • Who can pitch on a date, from pitch counts and required rest
  • A tournament / week availability grid
  • A downloadable pitch-count record for every game
  • A league-wide report that catches anyone over the max or on short rest
  • Built around baseball rules by age (softball supported too) — verify against your league's exact rules
  • High school teams: track every pitcher by class year under AIA rules on the tournament board
The Arm Health Passport screen in DiamondKeeper with the three how-it-works steps

Questions parents and coaches ask

Is this medical advice?

No. It's informational workload tracking to help you make better-informed decisions. It doesn't prevent injuries or decide whether a kid is safe to pitch.

Which rest rules does it use?

For baseball, rest days follow Pitch Smart guidance for the age you set. Softball is supported too. Always check your league's or tournament's exact rules.

My kid plays on a team that doesn't use DiamondKeeper.

Log the outing yourself — another team's game or a bullpen — and it counts toward the total.

Does the other coach have to do anything?

If each team keeps score in DiamondKeeper with arm care on and its roster synced, the outings combine on their own. If not, add the outside outing yourself and it still counts.

See the whole arm this season

Score your next game in DiamondKeeper, set the pitch-count age, and open the Arm tab.

Open the app

Running a league? See league tools.

DiamondKeeper helps families monitor throwing workload, recovery, arm-care habits and athlete-reported information so they can make better-informed decisions. It provides informational tools and is not a substitute for professional medical advice, diagnosis or treatment — it does not prevent injuries or determine whether an athlete is safe to pitch. Any pain or persistent soreness: see a qualified medical professional.