Velocity-based training, from your phone.
Metric measures barbell velocity from your phone's camera — no LPT, no sensor strap, no extra device. Free to use, validated against 3D motion capture in independent peer-reviewed research.
Rep tracking with nothing but the phone in your pocket.
Computer vision picks up the barbell from any iPhone or Android camera. Plate-recognition calibration, 1080p capture at 60fps, and all of it processed on-device, so nothing leaves your phone and the gear budget is the phone you already own. Validated against gold-standard 3D motion capture in independent peer-reviewed research.
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Bar path overlay
Live trajectory drawn on every rep's playback. Useful when technique is the question, not just numbers.
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13 metrics per rep
Mean and peak velocity, ROM, eccentric / concentric tempo, mean and peak power, time-to-peak, more.
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Local capture
Computer vision runs on your phone. No cloud round-trip, no internet required, no video leaves the device.
Validated for incredible accuracy.
- vs GymAware · 2026 CCC 0.982 vs GymAware across 95 reps — bench, squat, deadlift, power cleans. Metric iOS v6.9 + Android v1.2. 17 sets, multiple camera positions and lighting conditions.
- Taber et al. · 2023 ICC 0.98 vs 3D motion capture (gold standard) across 800+ reps. International Journal of Strength and Conditioning.
- Šagovac · 2024 r = 0.93 vs Vitruve LPT across 150 bench press reps. Master's thesis, University of Zagreb. 15 participants, v4.5.0.
Real-time numbers on every rep.
Velocity targets, velocity-loss thresholds, tempo metronomes, RPE prompts — every set has a coach in your ear if you want one. Or turn it all off and just record. Audio works through device speakers or whichever earbuds you're already wearing.
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Velocity target
Chime when a rep clears your prescribed speed; buzzer when it doesn't. Pick a number; train to it.
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Loss threshold
End the set the moment cumulative velocity loss crosses your cutoff. Autoregulation without thinking.
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Spoken readout
Pick a metric, hear it after every rep through your earbuds. Eyes on the bar, not on the screen.
“Exactly the same functions as an expensive velocity tracker. Very professional.”
Training that matches your recovery.
Every set feeds a load–velocity profile, an e1RM estimate, a velocity trend, and a personal-record tracker. The data shows up where you'd actually use it — in your next session's working weight, not in a spreadsheet you check once a quarter.
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LV profile, automatic
Two working sets at different loads is enough — the profile builds itself in the background.
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e1RM in real time
Estimated 1RM updates as you lift. No dedicated max-out session needed; it's a side-effect of training.
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Readiness traffic light
Today's top set vs. your rolling average. A glance tells you whether you're fresh, normal, or undercooked.
Build sessions. Track athletes. Coach remotely.
Metric is a full training platform, not just a rep counter. Build and program complete workouts, track every set across your training history, and run coach mode for multi-athlete sessions — all from the same app you use on the platform.
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Workout builder
Build full sessions from an exercise library, set loading schemes, and save reusable templates. Program a training block once; run it every week.
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Progress tracking
Personal records, velocity trends across sessions, and week-by-week volume by lift. Every session feeds a picture of where your training is going.
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Coach mode
Manage multiple athletes from one device mid-session, switch athlete profiles without leaving the floor, and view per-athlete analytics for remote coaching.
Start with Metric today.
- Basic is free forever: full velocity tracking, video with bar path overlay, and training history with no rep cap or time limit.
- Pro adds the workout builder, e1RM, real-time audio feedback, RPE logging, load–velocity profiling, and spreadsheet exports.
- Pro Coach scales with your roster: multi-athlete session management, team leaderboards, per-athlete analytics, and remote coaching tools.
Family plans share a Pro subscription across up to five training profiles.
The questions we keep getting.
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Do I need any extra hardware?
No. Metric uses your phone's camera: stand the phone up, point it at the bar, hit record. It calibrates to standard plate sizes out of the box, and you can configure non-standard setups.
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How accurate is it really?
CCC 0.982 for mean velocity vs GymAware across 95 reps in our June 2026 internal validation, and validated against 3D motion capture in an independent peer-reviewed study (Taber et al. 2023). The algorithm has only got more accurate since.
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Does it work for Olympic lifts?
Yes. Olympic lifts track automatically on the default camera setting. Point and shoot like any other lift, with no special mode to switch on.
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Can a coach manage multiple athletes from one device?
Yes. Pro Coach plans handle multi-athlete workouts, mid-session profile switching, team leaderboards, and per-athlete analytics. Athletes can also run Pro on their own device under the coach's subscription.
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Is my data private?
Computer vision runs on-device. Videos stay on your phone unless you choose to share or export them.
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iPhone or Android?
Both. Metric runs on iPhone, iPad, and modern Android phones, and it's on the App Store and Google Play now.
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Is Metric free to use?
Yes. Velocity tracking is the headline feature and it's free. The paid tier adds the workout builder, e1RM, audio feedback, and exports, which earn their keep once VBT is part of how you actually program rather than something you're trying out.
Free to download. Unlimited sets.
Standard plates, a stand for your phone, and the lift you were going to do anyway. The first session works out of the box.