Beat Offset — tap rhythms against a click and see every millisecond

Tap a notated rhythm against a click synthesised in your browser (or a visual click with sound off) and see every tap early or late in milliseconds: by beat position, by bar, drift over the take, the tempo you actually kept, and what happens when the click drops out - drawn on a scrolling beat-grid timeline, with latency calibration and tempo progression, all free. A coach (gpt-terra, metered) reads the timing profile and prescribes a 3-5 exercise practice set that loads with one tap, then re-checks you after practice; every number it cites is checked against the page's measurements. Derived from @onewave-ai/practice-plan-creator (onewave-ai/claude-skills, MIT).