Pull-Up Form Check
Wondering if your pull-up is solid? Prop up your phone — GOODREPS watches your elbow angle (shoulder → elbow → wrist) live and scores every rep while you train your back and biceps, with shoulders, forearms and core assisting. Free in your browser today; coming to Google Play and the App Store.
Coming to Google Play & the App Store▶ Try The Form Check
LIVEHOW TO DO A PROPER PULL-UP
Setup Hang from a bar facing toward (or away from) the camera, palms facing forward.
- Pull yourself up until your chin clears the bar.
- Drive your elbows down and squeeze your back.
- Lower under control to a full hang.
Same sheet as the ⓘ panel in the app — animated demo included.
THREE STEPS TO A SCORED PULL-UP
Prop your phone and get in frame
Phone at roughly torso height, stand facing the camera. A quick camera test checks lighting, distance, and angle before you start.
The camera locks a 17-point skeleton on you
GOODREPS measures your elbow angle (shoulder → elbow → wrist) on-device — no wearables. A pull-up bar — a doorframe bar works fine. Bodyweight is the weight.
Move — and watch the form bar
The bar fills from ~160° toward ~50° at the bottom. Cut range short and it tells you; full ROM is what counts.
WHAT THE CAMERA WATCHES
- Your elbow angle, live — from roughly 160° at a dead hang up toward 50° at the top. Chin-reaches don't bank; real pulls do.
- Your personal range of motion — after 3 clean reps the counter calibrates to your build and grip.
- The finish up top — fall short and the form cue is the standard: "Chin over bar."
COMMON PULL-UP MISTAKES
Kipping without meaning to
A swing at the bottom is momentum doing your reps. Start each pull from a still hang — quiet legs, braced core.
Chin reaching instead of pulling
Craning your neck over the bar isn't the same as pulling your chest to it. Lead with your chest and let the chin follow.
Half-range at the bottom
Not returning to a full hang keeps your lats on vacation. Straight(ish) arms at the bottom — that's where the next rep starts.
Shoulders up in your ears
Set your shoulder blades down and back before you pull. It protects the joint and connects the pull to your back.
PRIVATE BY DESIGN
Pose detection runs in your browser via TensorFlow.js. Camera frames are analyzed in real time and immediately discarded — nothing is recorded, nothing leaves your phone, and we never see them. Sign-in is optional; skip it and everything stays local.
QUESTIONS, ANSWERED
What if I can't do a pull-up yet?
Start with dead hangs and slow negatives (jump up, lower down slow) — both build the exact strength you need, and the app tracks your holds too.
Does it work in a home gym or low light?
Run the built-in camera test first — it checks your lighting, distance, and angle with live green checks before you start. If a rep still slips through, manual counting is always one tap away.
Is my camera feed uploaded anywhere?
No. Pose detection runs entirely on your phone, in your browser. Frames are analyzed in real time and immediately discarded — nothing is recorded, nothing is uploaded.
RELATED GUIDES
Free forever — camera counting for all 60 exercises, no account needed. Pro (voice coaching, programs, depth-camera form checks) is $7/mo, $49/yr, or $99 once. No ads, ever.