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Stoat vs Mattermost: catalog facts
Stoat	Mattermost
Free Free to use, with no ads according to the site.	Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…
Windows, macOS, Linux, Android, iOS, Web	Windows, macOS, Linux
Servers, channels, voice chat and file sharing in one app Role-based permissions and moderation tools for large communities	The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances
Requires an account to use Smaller user base than mainstream community chat apps	Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client
Downloadable app, Web application	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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