Check your riding position with AI video analysis — directly in your browser. Knee angle, hip angle, back angle and KOPS with real centimetre recommendations. So pain on the bike becomes a thing of the past.
In most cases the cause is measurable: saddle too high or too low, too far forward or back, cockpit too long. A professional bike fit costs €150–400. You get the key measurements right here with your phone.
An over-bent or over-extended knee at bottom dead centre is the most common cause of knee pain from cycling. Measured as a median over multiple pedal cycles.
An overly closed hip angle at top dead centre and an unsuitable back position lead to hip problems and back pain — both are detected automatically.
Knee over pedal spindle: calibrated via your crank length, the app works in real centimetres and tells you exactly how far to move your saddle.
All you need is your phone, a tripod and an indoor trainer.
Phone to the side at saddle height, approx. 3–4 m away. The app checks live whether height, distance and angle are right — with a traffic-light display.
A short recording is enough. AI pose detection runs locally in your browser and captures every joint in every frame. Optional: rear view for the symmetry analysis.
All angles with traffic-light ratings plus concrete recommendations: "raise saddle by ~1 cm", "move saddle back 1.5 cm". Analysis video with overlay included as download.
From a quick check to a complete analysis with power data.
Knee, hip, back and elbow angles, KOPS and cadence — cycle-based analysis, robust against measurement noise.
Knee tracking (valgus/varus), pelvic tilt and heel movement — normalised to your hip width, comparable between sessions.
Pair a tablet as a big display and see your angles in real time while you adjust your saddle. Change → see the effect immediately.
Bring power, cadence and left/right balance into the analysis via Bluetooth (Favero, Garmin & co.).
Prioritised recommendations phrased like a bike fitter — including trends across your saved sessions.
Every session is saved. See whether your adjustments work — the foundation of the upcoming coaching mode.
Measuring is free. Pay only if you want the comprehensive AI analysis.
Everything you want to know before your first analysis.
A smartphone with a camera, a tripod (or a stable surface) and an indoor trainer or a safe way to pedal in place. The analysis runs directly in your browser — no app installation required.
Angles are calculated as medians over multiple pedal cycles, not from a single frame. Using your crank length, the app calibrates itself to real centimetres — the pedal traces a circle with exactly the crank radius. Professional systems with multiple calibrated cameras are more precise; the app delivers reliable tendencies and concrete adjustment directions.
Measurement and basic analysis are free. The comprehensive AI detailed analysis with prioritised recommendations costs a one-off €4.99 per analysis — no subscription.
Yes. Pose detection runs entirely locally in your browser — the video never leaves your device. Only measurements (angles, centimetres) are optionally stored; video stills are only transmitted if you actively enable the visual AI analysis.
Common causes of knee, hip and back pain are incorrect saddle height, saddle position or cockpit length. The analysis makes exactly these angles visible and gives concrete adjustment recommendations in centimetres. For persistent pain, also seek medical advice.
The video analysis works best in Chrome or Edge on Android and desktop. On iPhone there are currently limitations (e.g. no Web Bluetooth for power meters); optimised iOS support is in the works.
The fundamentals explained clearly — with target values and guides. See all articles →
LeMond formula, heel method and knee-angle measurement — with target values and a step-by-step guide.
Front, back, inside or outside? The location of the pain reveals the cause — and the right adjustment.
Saddle forward or back? What KOPS means and how to measure it by video without a plumb line.