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RomM vs LaunchBox: catalog facts
RomM	LaunchBox
Free The open-source software is available without a license fee. Hosting is separate.	Freemium The core launcher is free. Big Box and premium features require a paid licence.
Web, Self-hosted	Windows
Web library with metadata, artwork and in-browser play Save synchronisation across devices through the server	Huge metadata and artwork database with automatic importing Big Box mode is built for arcade cabinets and controller-only use
Docker deployment and a database to maintain In-browser emulation performance is limited compared with native emulators	Big Box and several features require a paid premium licence Windows only, closed source
Self-hosted, Web application	Downloadable app
Open source	Closed 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 22, 2026

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