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

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