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ACE Studio vs OpenUtau: catalog facts
ACE Studio	OpenUtau
Paid Commercial software; check the official site for current plans.	Free Free and open source under the MIT licence.
Windows, macOS	Windows
Generates sung vocals from melody and lyrics Combines voice generation with a vocal production workspace	Open-source successor to UTAU Works with the UTAU voicebank ecosystem
Proprietary commercial software Little public detail on the site about plans and requirements	Requires voicebanks and some setup before first use Documentation lives mainly in the GitHub wiki
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.