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Mattermost vs Trillian: catalog facts
Mattermost	Trillian
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Freemium Free for individuals, with paid plans for businesses and healthcare.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Apps for all major desktop and mobile platforms HIPAA-compliant plans for healthcare use
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Proprietary and closed source Business and healthcare features require a paid plan
Downloadable app	Downloadable app, 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 October 1, 2026

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