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Mattermost vs Google Chat: catalog facts
Mattermost	Google Chat
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Freemium Free with a Google account; business features come with paid Google Workspace plans.
Windows, macOS, Linux	Web
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Integrated with Gmail, Drive and Docs Spaces with threaded conversations
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Requires a Google account Hosted by Google with no self-hosting option
Downloadable app	Web application, Hosted service
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 September 24, 2026

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