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Rocket.Chat Desktop vs Slack: catalog facts
Rocket.Chat Desktop	Slack
Free The open-source software is available without a license fee. Hosting, hardware and…	Freemium Free plan available, with paid plans for more features.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Web
Provides desktop packages for Windows, macOS and Linux.	Channels keep team conversations organized Large range of app integrations
Workspace access and server licensing are separate from the desktop client.	Closed source hosted service Many features and AI tools sit behind paid plans
Downloadable app	Downloadable app, Web application, Hosted service
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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