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openutau/OpenUtau

A free, open-source singing synthesis editor for UTAU users, supporting UTAU voicebanks, phonemizers, and plugins on Windows, macOS, and Linux.

Open-source alternative to:Vocaloid

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What is it?

OpenUtau is a singing synthesis editor built for the UTAU community, intended as an open-source successor to UTAU. It lets users write melodies in a MIDI-style piano roll and render them with UTAU-compatible voicebanks, including ENUNU AI singers.

The editor covers the main workflow for vocal tracks: a feature-rich MIDI editor, a vibrato editor, expression curves in place of UTAU's flags, and pre-rendering with built-in resamplers for previewing. Phonemizers for VCV, CVVC, Arpasing and several languages (English, Japanese, Chinese, Korean, Russian and more) handle lyric-to-phoneme conversion, and a plugin system supports custom macros and phonemizers.

OpenUtau is not a full digital audio workstation and does not aim for Vocaloid compatibility beyond limited features such as importing VSQX tracks. It runs on Windows, macOS and Linux and includes UI translations and non-English file system encoding support.

Key features

  • 01Feature-rich MIDI editor with mouse and keyboard navigation.
  • 02Vibrato editor and expression curves for tuning.
  • 03Pre-rendering and built-in WORLDLINE-R resampler for previews.
  • 04Phonemizers for VCV, CVVC, Arpasing and many languages.
  • 05Plugin system for editing macros and phonemizers.
  • 06Runs on Windows, macOS and Linux.

Use cases

  • Producing covers and original songs with UTAU-compatible voicebanks.
  • Tuning vocal tracks with vibrato and pitch-curve expressions.
  • Developing custom phonemizers or editing macros as a plugin author.

Topics

#singing-synthesis#utau#music#vocal-synthesis#midi#audio#openutau#singing-voice-synthesis#speech-synthesis#vocaloid

FAQ

What is OpenUtau?
A free, open-source singing synthesis editor for UTAU users, supporting UTAU voicebanks, phonemizers, and plugins on Windows, macOS, and Linux. OpenUtau is a singing synthesis editor built for the UTAU community, intended as an open-source successor to UTAU. It lets users write melodies in a MIDI-style piano roll and render them with UTAU-compatible voicebanks, including ENUNU AI singers.
Is OpenUtau free to use? What license does it have?
OpenUtau is open source under the MIT license. Check the license terms before using it in commercial products.
Is OpenUtau still maintained?
Actively maintained. The last commit to OpenUtau was on Oct 22, 2026.
What can I use OpenUtau for?
Producing covers and original songs with UTAU-compatible voicebanks. Tuning vocal tracks with vibrato and pitch-curve expressions. Developing custom phonemizers or editing macros as a plugin author.
Where can I get OpenUtau?
The source code and installation instructions are on GitHub: https://github.com/openutau/OpenUtau

Summary generated by AI from the project's README. GitHub stats refresh daily.

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