Voice-powered workout tracking

Just say it.
Build logs it.

Call out your reps mid-set and Build logs them before you rack the bar. No typing. No fumbling with your screen.

Built for serious lifters · iPhone & Apple Watch · Free to start
"Squat 275 for 6"
Workout
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Your workout, ready to log
Listening…
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Build showing the set it heard
Logged
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Set logged and checked off
Voice logging

Log a set without typing a thing.

Build on Apple Watch
Watch
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Apple Watch

Leave your phone in your bag.

  • Current set, target reps & live rest timer
  • Live heart rate and calories burned
  • Tap or talk to log a set, right from your wrist
Pick a routine
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Choose a routine screenshot to import
Reading…
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Build reading the routine from your photo
Ready
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Imported routine ready to track
Routine import

Bring your whole program with you.

Everything else

A complete tracker, minus the busywork.

Everything serious lifters expect — fast, and out of your way.

Apple Watch

Your set, rest timer, and heart rate — logged from your wrist.

Apple Health

Workouts sync to Apple Health: duration, calories, heart rate.

Progress & PRs

Personal records, per-exercise charts, a dashboard you arrange.

Supersets, RPE & plates

Superset groups, RPE, set types, and a plate calculator.

Works offline

No signal? Keep logging — it syncs when you're back.

Your data, exported

Import from any app. Export to CSV anytime. No lock-in.

Stop typing at the gym.

Log faster, lift more. Run your next workout by voice.