Real-time rhythm trainer. We hear your mic and detect your attack with spectral-flux + energy onset detection, then call out EARLY / LATE / PERFECT in milliseconds against the click. Watch the rotating guide — hit when the marker reaches the top. Each take is 8 bars with a 1-bar count-in, then review on a DAW grid and play back with the click.
Timing off? Hit Auto-Tare while the click runs and clap on 3 beats — we measure and fix your mic's hardware latency. Wear headphones so the mic doesn't hear the click. If the DETECTOR box (top-right) shows status live and rms rising when you make noise, the mic is working.
Requires microphone permission. Best in Chrome / Edge. Open via a local server if mic is blocked on file://.