MyPowerTennis measures your swing speed right on your Apple Watch – no camera, no tripod, no setup. Put the Watch on, tap Start, swing. Speed, contact point and a Stroke Score from 0–100 appear instantly on Watch and iPhone.
One number per stroke – from speed, contact point, precision and spin. Compare strokes and sessions at a glance.
Racket-head speed (radius-based, |ω| × radius) and drift-damped wrist speed – two methods, in km/h or mph.
On Apple Watch Series 8/9/10 and Ultra: precise contact moment (±1–5 ms), acceleration and follow-through time, timing index.
Topspin, flat or backspin on groundstrokes – as an rpm range when the data allows.
A reconstructed 2D path of the wrist, colored by speed. The precision score rates the consistency of your strokes – independent of raw speed.
Every session is saved – neatly grouped by day. Trend over weeks, filter by stroke type. Export as CSV, PDF or JSON archive.
From your latest swing to the long-term trend.
Stroke Score per shot
History by day
Spin & pronation
Swing path
Your trend, day by day
Live speed in real time
Transparency over promises: MyPowerTennis gives reliable, relative speed values to compare and improve – it is not a lab instrument.
The Watch buzzes once you reach your target speed (default 80 km/h, adjustable). The iPhone shows your latest swing in real time.
All features at a glance – explained in one minute. And here you can see the app in action on court.
Put the Watch on, tap Start, swing.