How it works

Build a beat, inspect its future, then let it evolve.

1. Draw the current pattern

Each row is a drum voice and each column is a step. Select a dark cell to turn it on. The pattern contains Kick, Snare, Closed hat, Open hat, Clap, Tom, Rim, and Shaker tracks. Tempo ranges from 40 to 220 BPM, with sixteenth, eighth, and eighth-note-triplet subdivision choices.

2. Read the next-generation preview

A living cell survives when it has two or three neighbours. A dead cell becomes alive when it has exactly three. All other cells are off in the next generation. In bounded mode, cells beyond the edge do not exist. Wrap mode connects the left edge to the right and the top to the bottom.

3. Lock essential cells

Turn on the lock tool, then select any cell whose current state must be preserved. Locked active cells remain active and locked inactive cells remain silent. Return to Edit cells before drawing notes again.

4. Play and navigate

Play runs the sixteen-step sequence. Auto-evolve applies the preview when the playhead completes a loop. Life forward applies one generation manually. Life back restores a previously stored generation, while Reset returns to the selected original seed.

5. Mix, share, and record

Mute excludes a track. Solo limits playback to soloed tracks, and each range control changes that track’s level. Share URL saves the pattern and settings in the address. Record captures the synthesized master output in browsers with MediaRecorder and downloads a WebM audio file when stopped.

Start with Copper Pulse if you want a steady reference beat. Night Bloom, Crosswind, and Stairwell are deliberately less symmetrical and can change more quickly.