Rep-by-rep form scoring
Each rep is graded against rules built for that exact lift — depth, torso lean, knee valgus, lockout, range of motion.
56 exercises · on-device AI
Nobody's watching your form.
Nobody's watching your form.
Now something is.
Prop up your phone and lift. Repzo tracks your joints frame by frame, counts every rep, and tells you exactly where your form slipped — depth, back angle, knee tracking, tempo.
iPhone · Free to start · Nothing leaves your phone
8 reps · Back Squat
Depth 96° below parallel
Knee tracking good
Chest dropping rep 7–8
56exercises analyzed
33joints tracked
0videos uploaded
<1sto your breakdown
It knows more than squats
Every lift gets its own rules. A deadlift is judged on hip hinge, a press on elbow path, a plank on hold time.
Feedback that actually means something
No wearables. No trainer. No guessing whether that last rep counted.
Reps counted for you
A deterministic state machine watches your joint angles, so the count is right even when you grind out the last one.
AI coach, on your set
When a set ends, an AI coach reads your rep metrics and writes back plain-English cues — what to fix, and what to keep doing.
History that shows progress
Every session is saved on your phone. Watch depth, consistency, and volume trend over weeks — not just today's numbers.
Share cards & gym buddies
Turn a session into a clean card with your skeleton overlay and stats. Add friends, react to their sets, keep each other honest.
Make it yours
Eight themes, light and dark. Tune the form thresholds to your own mobility instead of fighting someone else's idea of depth.
Three steps. That's the whole thing.
You don't tag anything, trim anything, or upload anything.
Prop up your phone
Side-on for squats and hinges, front-on for presses and raises. Repzo tells you if it can't see your whole body.
Do your set
It finds your 33 body landmarks in every frame and counts reps live. Your camera feed never leaves the device.
Read your breakdown
Per-rep scores, the specific faults it caught, and coaching cues — waiting for you before you've racked the weight.
Your gym videos stay yours
Most "AI fitness" apps ship your camera to a server. Repzo doesn't have to — the analysis runs on your phone's own hardware.
- Pose analysis is on-device. Frames are processed locally and discarded — no video is streamed anywhere.
- Your workout history is local. Sessions, reps and photos live in a database on your phone, not in our cloud.
- You choose what's social. An account only backs friends and shared posts. Share a set deliberately, or never.
- No ads, no data brokers. We don't sell what you lift, when you lift, or what your body looks like doing it.
What we'd have to upload: nothing
The pose model runs inside the app. There's no "processing your video" step because there's no server doing the processing.
Camera frames on-device
Rep history on-device
Photos on-device
Friends & posts only if you share
Questions, answered
The ones people actually ask.
Do I need any special equipment?
No. A phone and something to lean it against. No watch, no strap, no sensors, no gym Wi-Fi.
Does it work in a busy gym with people walking past?
Yes. Repzo locks onto one person and keeps tracking them, so someone crossing behind you won't hijack your rep count.
How accurate is the form feedback?
Rep counting is deterministic — it's driven by real joint angles crossing thresholds, not a guess from a model. Form scoring uses per-exercise rules built from coaching standards, and you can tune the thresholds to your own mobility. It's a very good second pair of eyes, not a replacement for a coach on a max attempt.
Where does my video go?
Nowhere. Pose estimation runs on your phone and frames are discarded after analysis. Your sessions are stored locally on the device. See our privacy policy.
Is there an Android version?
iPhone first. Android is planned — leave your email and we'll tell you when it's real rather than promise a date we'd miss.
What does it cost?
The core — rep counting, form analysis, your history — is free. A Plus subscription will cover the AI coach and advanced analytics. Final pricing lands at launch.
Stop guessing about your form
Repzo is in development for iPhone. Leave your email and you'll be in the first group through the door.
No spam, one email when it ships. Privacy.
Coming soon on theApp Store
Planned forGoogle Play