"Mattermost Classic" is the original mobile app for Mattermost. For our newer second generation mobile apps, look for "Mattermost" on the App Store.
To use this app, you need a "Server URL" from a Mattermost server v3.0+.
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Mattermost is secure workplace messaging from behind your firewall.
Host your own server: https://about.mattermost.com/download/
Terms of Service: https://about.mattermost.com/terms
This is a reference implementation of an open source Mattermost iOS app available at: https://github.com/mattermost/ios