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RomM vs ES-DE: catalog facts
RomM	ES-DE
Free The open-source software is available without a license fee. Hosting is separate.	Freemium Free on desktop. The Android version is a paid purchase.
Web, Self-hosted	Windows, macOS, Linux, Android
Web library with metadata, artwork and in-browser play Save synchronisation across devices through the server	Systems come preconfigured, so setup is mostly pointing it at your ROM folders Built-in scraper fetches artwork, videos and metadata
Docker deployment and a database to maintain In-browser emulation performance is limited compared with native emulators	The Android version is a paid purchase Theme configuration has a learning curve
Self-hosted, Web application	Downloadable app
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 22, 2026

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