A polyrhythmic metronome that runs in your browser. Keep a steady 4/4 pulse going and layer any ratio on top of it — 3:4, 5:4, 7:4, anything up to 16:4 — then mute the beats you want to feel instead of hear. No account, no install, no cost.
A polyrhythm is two rhythms with different beat counts played across the same span of time. In a 3 against 4 polyrhythm, one voice divides the bar into three even beats while another divides it into four. Both start together on the downbeat, pull against each other in the middle, and land together again at the top of the next bar. Each layer here gets its own pitch, so you can pick the lines apart while they overlap.
Set the tempo with the knob or the Tap button, press space to start, then hit + Add Track and choose a ratio to lay a polyrhythm over the 4/4 reference pulse. Click any beat dot to mute that single beat — silencing a layer's downbeat is a good way to force yourself to internalise where it falls.
Working a passage up to tempo is the whole job, so the metronome will do it for you. Open Practice Mode, choose how many BPM to add and how many bars to wait between increases, and the tempo climbs on its own while you play. Start a lick at 60 BPM, add 5 BPM every 8 bars, and let it walk you up to speed without ever reaching for the controls.
More questions? Read the polyrhythm metronome FAQ.