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Mattermost vs Discord: catalog facts
Mattermost	Discord
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Freemium Free to use, with an optional Nitro subscription.
Windows, macOS, Linux	Windows, iOS, Web
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Drop-in voice channels without placing calls Low-latency screen and game streaming
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Proprietary and centrally hosted Some features sit behind the Nitro subscription
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 23, 2026

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