Tap along to a beat and find out where your feel really sits. The Pocket calibrates your reaction latency, then measures your drift once you stop counting and start grooving — and tells you your Pocket Score and your groove twin, from J Dilla to the drum machine.
Every browser adds a fixed delay between your tap and the clock, and so does your own reaction time — which would label everyone a laid-back genius. So Round 1 measures your personal zero on a bare metronome, and Round 2 subtracts it. What's left is real: how far your feel drifts once you stop concentrating. The timeline shows every tap scattered ahead of or behind the beat, so you can see the result for yourself.
New to the idea? Read The Pocket, Swing, Groove, and Quantization in the Producer's Bible.