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

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