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Mattermost vs Stoat: catalog facts
Mattermost	Stoat
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Free Free to use, with no ads according to the site.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Web
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Servers, channels, voice chat and file sharing in one app Role-based permissions and moderation tools for large communities
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Requires an account to use Smaller user base than mainstream community chat apps
Downloadable app	Downloadable app, Web application
Open source	Open 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 23, 2026

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