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Mattermost vs Nextcloud Talk: catalog facts
Mattermost	Nextcloud Talk
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Free Free and open source as part of a Nextcloud server you host.
Windows, macOS, Linux	Android, Web, Self-hosted
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Runs on your own server Chat, calls and webinars in one app
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Needs a Nextcloud server to use Setting up reliable video calls takes extra server work
Downloadable app	Downloadable app, Web application, Self-hosted
Open source	Open 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.