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ROCKNIX vs MustardOS: catalog facts
ROCKNIX	MustardOS
Free Free, built from open-source components, with donations accepted.	Free Free to download from the official release page.
Linux	Linux
Supports many handhelds from several brands Built-in save sync through Syncthing and rclone	Extensive theming and personalisation options Aims for minimal setup before playing
Only runs on supported devices Installing replaces or bypasses the stock firmware	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 September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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