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Mattermost vs Synology Chat: catalog facts
Mattermost	Synology Chat
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Free License-free, but it requires a Synology NAS to host the server.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Web, Self-hosted
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Messages stay on your own NAS Optional end-to-end encryption for conversations or channels
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Only runs on Synology NAS hardware Closed source
Downloadable app	Downloadable app, Web application, Self-hosted
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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