/trigstop — Trigger Stopwatch
A stopwatch you start and stop with whatever you like — a key press, a loud sound (clap, whistle, starter pistol), or motion in the camera. Time a sprint off a clap, a reaction, or anything that crosses the frame. All sensing happens in your browser; nothing is recorded.
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Pick your triggers, then arm.
Sound and motion triggers need microphone or camera access — you will be asked when you arm.