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Mattermost vs Chanty: catalog facts
Mattermost	Chanty
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Freemium Free to start, with paid plans listed on the pricing page.
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	Free guest access for external contacts States HIPAA, GDPR and SOC 2 Type II compliance
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Proprietary hosted service only Growing focus on AI agents may not suit everyone
Downloadable app	Downloadable app, Web application, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Account needed
Needs internet	Needs internet
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.