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ACE-Step vs Udio: catalog facts
ACE-Step	Udio
Free Free and open source under the MIT license.	Freemium The fetched page did not list plans; check the site for current pricing and limits.
Windows, macOS, Linux, Command line	Web
Runs locally across Mac, AMD, Intel and CUDA hardware Actively maintained with a 2026 model-series update	Generates music tracks in seconds Built-in discovery feed of shared music
Local generation quality and speed depend heavily on the hardware used Best results likely still require a capable GPU despite broader hardware support	Runs only as an online service Current plan details and usage limits were not visible on the homepage
Downloadable app, Self-hosted	Web application
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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