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RomM vs Retrom: catalog facts
RomM	Retrom
Free The open-source software is available without a license fee. Hosting is separate.	Free Free to use; the source is published on GitHub.
Web, Self-hosted	Self-hosted
Web library with metadata, artwork and in-browser play Save synchronisation across devices through the server	One central library shared across several machines Integrates emulators for launching games
Docker deployment and a database to maintain In-browser emulation performance is limited compared with native emulators	Requires running and maintaining your own server Mainly aimed at emulation rather than modern PC stores
Self-hosted, Web application	Self-hosted
Open source	Open source
License: AGPL-3.0	License not stated
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 September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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