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

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