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Gaseous Server vs RetroArr: catalog facts
Gaseous Server	RetroArr
Free Free and open source under the AGPL 3.0 license.	Free Free and open source under the MIT licence.
Web, Self-hosted	Self-hosted
Identifies ROMs and adds metadata from multiple sources Play games in the browser through the built-in emulator	Recognises files for more than 170 platforms Metadata from IGDB, ScreenScraper, Steam and GOG
Needs a server to run Little documentation outside the repository	Young project with a small user base IGDB metadata needs Twitch developer credentials
Self-hosted	Self-hosted
Open source	Open source
License: AGPL-3.0	License: MIT
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 October 2, 2026

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