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RetroArr vs RomM: catalog facts
RetroArr	RomM
Free Free and open source under the MIT licence.	Free The open-source software is available without a license fee. Hosting is separate.
Self-hosted	Web, Self-hosted
Recognises files for more than 170 platforms Metadata from IGDB, ScreenScraper, Steam and GOG	Web library with metadata, artwork and in-browser play Save synchronisation across devices through the server
Young project with a small user base IGDB metadata needs Twitch developer credentials	Docker deployment and a database to maintain In-browser emulation performance is limited compared with native emulators
Self-hosted	Self-hosted, Web application
Open source	Open source
License: MIT	License: AGPL-3.0
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 October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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