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Mattermost vs Pumble: catalog facts
Mattermost	Pumble
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Freemium Free with unlimited users and message history; paid plans are sold for businesses.
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	Unlimited users and message history on the free offering Channels, threads, calls and recording in one app
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Hosted service only, with no self-hosting option Closed source
Downloadable app	Downloadable app, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
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.