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Element Web vs Mattermost

The same facts for both, read from GitHub every night, and the relation a person reviewed.

Element WebMattermost
LanguageTypeScriptTypeScript
LicenceAGPL-3.0Other
Stars14k40k
Latestv1.12.34v12.0.2
Last push2026-11-112026-11-12
Release cadencetoo few releasesabout 1 day between releases
Active contributors34+ commit authors on the default branch in the last 90 days54+ commit authors on the default branch in the last 90 days
Flagsnonenone

How they relate

  • Both replace Slack. Alternatives to Slack →

    PartialElement WebMatrix client for team rooms, threads and calls in the browser; needs a Matrix homeserver.

    Full replacementMattermostChannels, threads and calls on your own server, with an importer for Slack exports.