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Mattermost vs Campfire: catalog facts
Mattermost	Campfire
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Free No subscription; the code is published on GitHub.
Windows, macOS, Linux	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	Installs on your own server with one command Familiar layout for people coming from Slack or Teams
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	You have to run and maintain the server yourself Covers chat basics rather than a large integration ecosystem
Downloadable app	Self-hosted
Open source	Open source
License: Apache-2.0	License: MIT
Account needed	Not stated if an account is 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.