Ballet Protractor
Measure the split angle between your legs in real time, and keep your best record every day.
Ballet Protractor is a free app that measures the angle between your legs in real time with your camera.
Use it for splits, développé, and turnout practice — each session's best record builds up on a chart.
01 Real-time split angle
Measures how far your legs open — not the knee bend. Your pose is detected and the angle is shown large on screen.
02 Overlay video recording
Record videos with the measured angle burned in, then save them to your gallery or share them.
03 History & trend chart
Each session's best angle is saved automatically, and a chart shows your improvement at a glance.
04 Manual protractor
Includes a protractor tool to measure any angle on a photo you take or pick. Floor angles like turnout are auto-corrected even from tilted shots.
All analysis stays on your device
Camera frames are processed on your device only — never sent to a server. No sign-up required.
Frequently asked questions
Is the Ballet Protractor app free?
Yes — it's free, with no sign-up required.
Does it support both iPhone (iOS) and Android?
Yes, it's available on both the App Store and Google Play.
Are recorded videos sent to a server?
No — all analysis happens on your device, and camera footage is never sent to a server.
Can it measure oversplits beyond 180 degrees?
Yes, it measures and records oversplit angles past 180°.
Can it measure angles other than splits?
Yes — it includes a manual protractor for measuring any angle on a photo you take or pick. Floor angles like turnout are auto-corrected even from tilted shots.
Download now and start your record today