Scan to pick up the racket

Tap through the certificate warning. The address is …

Hold the phone like this

Grip it as you would a racket, screen towards you, and keep it still.

getting ready

Once per phone · Setup → Recalibrate to redo it

Swing sensitivity

Threshold1.00×

The bar follows the live swing strength. A swing registers when it crosses roughly the middle.

Racket

Show the aim ring

Marks where the racket head would meet the ball. Depth is hard to judge in a fixed first-person view; this says it plainly.

Every phone describes its own axes differently, so the racket's neutral pose is measured from the player rather than assumed. Press this if the racket is drawn at the wrong angle, or when a new phone takes over.

Sound

Volume85%

Every sound is synthesised, so there is nothing to load. Browsers will not start audio without a gesture — click the page once.

Link

Sample rate: —
One-way latency: —

Latency moves when we hear about a swing, not when it happened: swings are dated on the phone's clock and the offset is measured continuously.

Sensor diagnostics →

Leaderboard

Scan to pick up the racket

Hold the phone like this

Rally complete