01
Film it
Record straight from the app or pull a clip out of your camera roll. One angle, one rep, that's it.
iPhone · Biomechanics
Know your angles.
Film a rep on your iPhone. PRFCT Form traces your joints, measures the angles that matter, and tells you which ones are off — with the peer-reviewed research behind every call.
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Free 3-day trial / then $4.99 mo or $39.99 yr / cancel anytime
Front knee
In range
92°target 85–100°
Bezodis et al. 2015 · J. Biomechanics
How it works
Three taps to a verdict.
02
Trace it
Your joints get tracked frame by frame, the movement gets split into its phases, and every angle gets measured.
03
Fix it
Each angle is scored against a published range, so you see exactly which one is off and by how much.
Evidence
Every number has a paper behind it.
Form apps tell you it looked bad. PRFCT Form tells you the front knee hit 92° against a target of 85–100°, and names the study that set the range. You can go read it.
Front knee
Bezodis et al. 201592°85–100°
Rear knee
Slawinski et al. 2010128°115–135°
Front hip
Bezodis et al. 201947°40–60°
Trunk angle
Harland & Steele 199711°15–40°
Movements
Five built in. Add your own.
🏃
Block start
Set · drive
🏈
Tackle
Approach · contact
🏀
Jump shot
Load · release
💪
Push-up
Top · bottom
🏋️
Curl
Extended · contracted
+
Your movement
Set your own joints and ranges
Tracking runs on your phone
Your joints are traced on the device. No upload is needed to get a result.
Nothing is shared unless you say so
Clips only leave your phone if you turn that on, and you can withdraw them later.
Cancel in two taps
Billing runs through Apple. Manage or cancel from your iPhone settings, any time.
Be there for the first rep.
Leave your email and we'll tell you the day it lands on the App Store. Nothing else — no newsletter.
Free 3-day trial / then $4.99 mo or $39.99 yr / or a 5-clip pack for $4.99, no subscription