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AudioMass
AudioMass · founded 2018
What it is
AudioMass is a free, open-source web audio editor from AudioMass, started in 2018. It records and edits audio directly in a browser, with tools for cutting, copying, pasting, trimming, silencing, reversing, inverting, and processing selected waveform areas. Effects include gain, fades, compression, normalization, reverb, delay, distortion, pitch shifting, pitch and speed profiles, and repair tools. A looping feature offers crossfade preview, silence trimming, zero-crossing adjustment, repetition, and a separate editor tab. Multitrack mode arranges clips across tracks, adds automatic crossfades between overlaps, provides track controls and recording, and supports mixdown. Sessions save as .amss files, while final mixes export as WAV or MP3. The editor runs locally without a backend and can continue offline after loading. AudioMass is MIT licensed, with separate licenses for bundled libraries.
For and against
For
- Free plan costs $0
- Multitrack recording and mixdown
- Exports WAV and MP3
- Works offline after loading
- MIT licensed open-source software
Against
- Not particularly well optimized for mobile
- Very large files can consume browser resources
- No decoding progress or cancellation callback
- No cloud collaboration
The verdict
AudioMass combines detailed waveform tools, effects, looping, and multitrack work in a browser editor. Its mobile optimization and handling of very large files are the main limitations to consider.
Who it suits
AudioMass suits people who want browser-based recording and waveform editing without a subscription. It is also relevant to users needing multitrack sessions, looping, or offline continuation after loading.
Plans and prices
AudioMass
Free, open-source web audio editor
Read 9 Oct 2026 · audiomass.co
On the record
- Browser support
- The maker describes AudioMass as having browser and device support but does not list specific supported browsers or devices on the page.audiomass.co · read 9 Oct 2026
- Cloud collaboration
- Noaudiomass.co · read 21 Sep 2026
- Editing
- Users can cut, copy, paste, trim, silence, reverse, invert, or process selected waveform regions.audiomass.co · read 9 Oct 2026
- Effects
- Effects include gain, fades, compression, normalization, reverb, delay, distortion, pitch shifting, pitch and speed profiles, and repair tools.audiomass.co · read 9 Oct 2026
- Integrations
- The maker's About page describes importing audio files by drag and drop and exporting audio, but lists no third-party integrations.audiomass.co · read 9 Oct 2026
- Large file limitation
- The maker says loading a very large audio file can consume resources until decoding finishes, and the browser API provides no progress callback or cancellation.audiomass.co · read 9 Oct 2026
- License
- AudioMass is MIT licensed; bundled libraries have their own licenses, including an LGPL license for the MP3 encoder.audiomass.co · read 9 Oct 2026
- Looping
- The seamless loop tool supports crossfade preview, silence trimming, zero-crossing adjustment, repetition, and opening the loop in a new editor tab.audiomass.co · read 9 Oct 2026
- Maker and history
- The About page says AudioMass was started in 2018; it does not state a maker name, headquarters, or company founding date.audiomass.co · read 9 Oct 2026
- Mobile limitation
- The maker says AudioMass is not particularly well optimized for mobile yet.audiomass.co · read 9 Oct 2026
- Multitrack
- Multitrack mode supports arranging clips across tracks, automatic crossfades between overlapping clips, track controls, recording, and mixdown.audiomass.co · read 9 Oct 2026
- Multitrack editing
- Yesaudiomass.co · read 21 Sep 2026
- Offline use
- The editor runs locally in the browser without a backend and can continue working offline after it has loaded.audiomass.co · read 9 Oct 2026
- Product
- AudioMass is an open-source web-based audio and waveform editing tool for recording and editing audio.audiomass.co · read 9 Oct 2026
- Project files
- Multitrack sessions can be saved and reopened as .amss files, and final mixes can be exported as WAV or MP3.audiomass.co · read 9 Oct 2026
- Supported platforms
- webaudiomass.co · read 21 Sep 2026
