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MustardOS vs Onion: catalog facts
MustardOS	Onion
Free Free to download from the official release page.	Free Free to download, with source code published on GitHub.
Linux	Linux
Extensive theming and personalisation options Aims for minimal setup before playing	More than 100 built-in emulators tuned for the device Auto-save and resume for quick pick-up play
Only runs on supported handheld devices Flashing it replaces the device's stock firmware	Only runs on the Miyoo Mini and Mini+ handhelds Games and BIOS files must be supplied by the user
Operating system	Operating system
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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