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Mattermost vs stashcat: catalog facts
Mattermost	stashcat
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Paid The site directs organisations to request a quote or consultation.
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	Chat, video calls, and broadcast lists Groups, polls, and appointments
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Aimed at organisations and requires a sales inquiry
Downloadable app	Web application, Self-hosted, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Not stated if an account is 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 8, 2026

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