BELLOWS

Spec sheet

Product

BELLOWS is a free, open source audio engine and interactive browser instrument and workbench.Read 12 Oct 2026 · bellows.live

Supported platforms

webRead 22 Sep 2026 · bellows.live

Free plan

YesRead 22 Sep 2026 · bellows.live

License

The project is released under the Apache-2.0 license.Read 12 Oct 2026 · bellows.live

Maker

The site identifies Moheeb Zara (@virgilvox), hack.build, as the maker.Read 12 Oct 2026 · bellows.live

Audio engine

The library uses an AudioWorklet kernel that schedules events on the audio thread for sample-accurate timing.Read 12 Oct 2026 · github.com

Browser requirements

AudioWorklet is required; the repository lists Chrome 66+, Firefox 76+, and Safari 14.1+ as supported, while Web MIDI is limited to Chromium and Firefox.Read 12 Oct 2026 · github.com

Built-in instruments

The site says BELLOWS includes 18 built-in synthesizers and supports playing with a mouse, keyboard, or MIDI controller.Read 12 Oct 2026 · bellows.live

Commercial use

YesRead 22 Sep 2026 · bellows.live

Formats and MIDI

The library supports WAV encoding and decoding, standard MIDI file read and write, Web MIDI where available, and WebCodecs Opus export where available.Read 12 Oct 2026 · github.com

Generative music

A seed word can generate beats, basslines, melodies, and chords, with the same seed producing the same song each time.Read 12 Oct 2026 · bellows.live

Import sounds

Users can load SoundFont files or their own audio samples and play them across a keyboard.Read 12 Oct 2026 · bellows.live

Music theory

The library supports more than 30 scales, chord parsing, voice leading, negative harmony, and tunings including EDO and just intonation.Read 12 Oct 2026 · github.com

Offline rendering

The engine can run in Node without a browser to render songs to WAV files.Read 12 Oct 2026 · bellows.live

Recording

The browser workbench can record music to a WAV file, and the site says it requires no account or upload.Read 12 Oct 2026 · bellows.live

Sound tools

The engine includes synthesizers, drum machines, samplers, soundfont support, sequencing, and effects.Read 12 Oct 2026 · bellows.live

Use in projects

The library can be installed with npm, loaded from unpkg or jsDelivr, or imported into apps built with Vite or webpack.Read 12 Oct 2026 · bellows.live

Plans and prices

Every BELLOWS plan and price →

Where Specifiction places it

• AI music generators#107 of 1237.3