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Synology Chat vs Slack: catalog facts
Synology Chat	Slack
Free License-free, but it requires a Synology NAS to host the server.	Freemium Free plan available, with paid plans for more features.
Windows, macOS, Linux, Android, iOS, Web, Self-hosted	Windows, macOS, Linux, Android, iOS, Web
Messages stay on your own NAS Optional end-to-end encryption for conversations or channels	Channels keep team conversations organized Large range of app integrations
Only runs on Synology NAS hardware Closed source	Closed source hosted service Many features and AI tools sit behind paid plans
Downloadable app, Web application, Self-hosted	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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