TennisLooker

Wear your Apple Watch on court. Every swing, recorded.

What it tracks

Swings: a gentle tap on your wrist for every swing it counts, so you can check it right away.
Stroke types: forehand, backhand (two-handed, one-handed and slice counted separately), serve, overhead and volley.
Swing speed: top and average speed for each stroke type, plus the distribution.
Body: live heart rate, heart-rate zones, active and total calories, distance covered.
Matches: singles and doubles scoring (advantage, tiebreak), rally length, heart-rate recovery between games.
On iPhone: history, detailed session reports, long-term trends, CSV export and one-tap share posters.

The app interface is currently in Simplified Chinese.

Requirements

Apple Watch with watchOS 10 or later. Series 8, Ultra and newer sample motion 200 times per second; earlier models sample 100 times per second and still count swings normally.
iPhone with iOS 17 or later for history and trends. The watch app also works on its own and syncs when your iPhone is nearby.

Getting started

Wear the watch on your racket hand — on the other wrist it can barely see your swings.
On the watch, pick your backhand style in Settings, then run Stroke Calibration. Calibrating on court with real shots works best; return to the ready position and pause 2–3 seconds between swings.
Choose a mode (singles, doubles, rally practice, serve practice) and start playing when the countdown ends.
End the session to see the full report on iPhone and create a share poster.

FAQ

One swing counted twice, or swings missed?

Adjust Settings → Counting sensitivity on the watch or iPhone: choose the less sensitive level if it counts too many, the more sensitive level if it misses swings. If you changed your grip or technique, calibrate again.

Stroke types not recognized well?

Calibrate again and complete every stroke, using the same effort and stance as in real play. At the end the watch tells you which strokes are easy to mix up.

How accurate is swing speed?

The watch measures how fast your wrist turns and estimates racket-head speed from it — best for following your own progress. If you have a radar or speed display, enter its reading in a session’s swing-speed chart to calibrate automatically.

Serve or overhead?

The first shot of a point counts as a serve; during a rally it counts as an overhead. Use Serve Practice mode to count every swing as a serve.

Is my data safe?

Everything stays on your watch, iPhone and Apple Health. Nothing is uploaded and no account is needed. See the Privacy Policy.

Contact

Questions, ideas or recognition problems? Email vikhochan@icloud.com. Including your watch model and watchOS version helps a lot.

TennisLooker is not a medical device. Heart rate, calories and swing speed are for sports reference only.