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Mattermost vs JANDI: catalog facts
Mattermost	JANDI
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Freemium Plan prices are not listed on the fetched page; check the site for current plans.
Windows, macOS, Linux	macOS
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Team messenger focused on workplace collaboration AI summaries of conversation context
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Website and materials are mainly in Korean Hosted service that requires a team account
Downloadable app	Downloadable app, 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 October 2, 2026

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