SubverseLab builds free browser-based tools for arranging, generating, measuring, mixing and separating music. Everything runs in the browser with nothing to install, and everything below is free to use; some tools ask for a free account.
Genre-Aware Arrangement Starting Point Generator
Generate a genre-aware arrangement starting point, preview its structure and learn how to rebuild the idea in a DAW.
8-Bar MIDI Drum Pattern Generator
Generate 8-bar MIDI drum patterns in any of 22 genre styles, thin them live with per-channel density knobs, preview them on a 16th-note step sequencer across six drum channels, and export the result as standard MIDI files or a ZIP for any DAW. Pattern generation and every official export require SubverseLab membership.
Generate a Drum Pattern · Read the Sensei Drum Generator guide
Evidence-First Audio & Signal Measurement Console
Evidence-first audio measurement for your mix or master. Direct ITU-R BS.1770 LUFS, sample peak, crest factor, and one-third-octave spectral analysis, compared against a reference track or a genre profile, plus mono fold-down phase-loss detection. No fabricated scores, no invented metrics — just what the signal actually shows.
Stem separation, vocal removal and key/BPM analysis, in the browser
Separate a track into drums, bass, vocals and other instruments, pull the vocal off a mix, or read a track's tempo and musical key — all in the browser, nothing to install. Separation uses the HT-Demucs model with overlapping windows, so the stems have no seams at the segment joins.
Song and Cover into a 1080p YouTube Video
Turn a song and its cover into a YouTube video. Look at every style running on your own track first, taken from the busiest part of the song rather than the intro, then render the one you chose at 1920x1080.
Generative MIDI Pattern Workstation
Generate a 16-step synth pattern across four lead and two bass lanes, evolve it, shape the in-browser sound preview, and export the result as a standard MIDI file for any DAW. Patterns are ranked by a model that learns from what members choose to keep. Generation, evolution and every export require SubverseLab membership.
BPM and Key Calculator for Delay, Reverb and Repitch
Calculate BPM-synced delay and reverb times, key-to-Hz harmonics and sample repitch math, and hear each value before you use it. Runs entirely in your browser — no upload, no server processing, no account.
Every tool has a written guide explaining what it does, how to use it, and what its limits are. Browse all guides or read the help and FAQ.