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

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