Nubium
Nubium is open-source music notation software available on desktop and in a browser.
What Nubium is
Nubium is open-source music notation software available on desktop and in a browser. Its editor supports four independent voices per measure, multiple input modes, guitar tablature, and MIDI input. Scores use MusicXML, and users can paste or copy LilyPond and ABC notation. Nubium exports print-ready PDF scores and WAV audio; playback uses SoundFont instruments and follows repeats, D.S., D.C., codas, and volta brackets. For natural-language score edits, AI Chat can connect to Anthropic Claude, OpenAI, or Google Gemini using an API key supplied by the user. Users can install community plugins or write their own, and configure keybindings, settings, and layout. Automatic crash-recovery snapshots can restore a score after an unexpected app close. Nubium is licensed under AGPL-3.0, and its free plan requires no account. The maker describes the software as being in beta, with features being added quickly. Anonymous launch pings include version, operating system, and platform, but exclude IP address and user ID.
Good
- Runs on desktop and in a browser
- Supports tablature and MIDI input
- Exports PDF scores and WAV audio
- Crash-recovery snapshots restore scores
Watch out
- The maker describes Nubium as being in beta
- AI Chat requires a user-provided API key
- Anonymous launch pings include version, OS, and platform
Who it suits
Nubium suits musicians who need notation tools across desktop and browser, including guitar tablature and MIDI input. Its AI editing requires users to provide their own API key.
Verdict
Nubium offers notation, playback, and export tools alongside optional AI editing and plugins. Its beta status and bring-your-own-key AI setup are worth considering.
Plans and prices
From Nubium's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Free; no account required |
The facts
Each one read from Nubium's own pages, with the date it was checked.
What it does
- AI editing
- Users can edit scores with natural language and bring their own API key.checked 8 Oct 2026
- AI providers
- AI Chat supports Anthropic Claude, OpenAI, and Google Gemini using a user-provided API key.checked 8 Oct 2026
- Beta status
- The maker describes Nubium as being in beta and says features are being added quickly.checked 8 Oct 2026
- Deployment
- bothchecked 19 Sep 2026
- Exports
- Scores can be exported to print-ready PDF and WAV audio.checked 8 Oct 2026
- File formats
- Nubium uses MusicXML and can paste or copy LilyPond and ABC notation.checked 8 Oct 2026
- File recovery
- Nubium keeps automatic crash-recovery snapshots and restores a score after an unexpected app close.checked 8 Oct 2026
- License
- The public source repository identifies Nubium as licensed under AGPL-3.0.checked 8 Oct 2026
- MIDI support
- Yeschecked 19 Sep 2026
- MusicXML support
- Yeschecked 19 Sep 2026
- Notation features
- The editor supports four independent voices per measure, multiple input modes, guitar tablature, and MIDI input.checked 8 Oct 2026
- Parts extraction
- Yeschecked 19 Sep 2026
- Playback
- Playback uses SoundFont instruments and follows repeats, D.S., D.C., codas, and volta brackets.checked 8 Oct 2026
- Plugins
- Users can install community plugins or write their own, and configure keybindings, settings, and layout.checked 8 Oct 2026
- Product
- Nubium is open-source music notation software that runs on desktop or in a browser.checked 8 Oct 2026
- Support
- The maker directs users to GitHub for source code and issues and to Discord to ask questions and share work.checked 8 Oct 2026
- Tablature support
- Yeschecked 19 Sep 2026
- Telemetry
- The repository says anonymous launch pings include version, OS, and platform and exclude IP address and user ID.checked 8 Oct 2026
Money
- Free plan
- Yeschecked 19 Sep 2026
Where it runs
- Platforms
- Desktop downloads are listed for macOS, Windows, and Linux, with a browser version also available.checked 8 Oct 2026
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