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Discord vs Mattermost: catalog facts
Discord	Mattermost
Freemium Free to use, with an optional Nitro subscription.	Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…
Windows, iOS, Web	Windows, macOS, Linux
Drop-in voice channels without placing calls Low-latency screen and game streaming	The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances
Proprietary and centrally hosted Some features sit behind the Nitro subscription	Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client
Downloadable app, Web application, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
Account needed	Account needed
Needs internet	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.