compare
Mattermost vs Openfire
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Mattermost | Openfire |
|---|---|---|
| Language | TypeScript | Java |
| Licence | Other | Apache-2.0 |
| Stars | 39k | 3.1k |
| Latest | v11.11.1 | v5.1.2 |
| Last push | 2026-10-06 | 2026-10-01 |
| Release cadence | too few releases | about 38 days between releases |
| Active contributors | 50+ commit authors on the default branch in the last 90 days | 5 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace Slack. Alternatives to Slack →
Full replacementMattermostChannels, threads and calls on your own server, with an importer for Slack exports.
PartialOpenfireAn XMPP server with a web admin console; teams chat through an XMPP client such as Spark.
Mattermost
- v12.0.0-rc32026-10-05Mattermost Platform Release 12.0.0-rc3pre-release
- v11.10.3-rc12026-10-02Mattermost Platform Release 11.10.3-rc1pre-release
- v12.0.0-rc22026-09-25Mattermost Platform Release 12.0.0-rc2pre-release
- v11.11.12026-09-24Mattermost Platform Release 11.11.1 contains various bug fixes.
- v12.0.0-rc12026-09-18Mattermost Platform Release 12.0.0-rc1pre-release
Mattermost
✓ signed The latest release, v11.11.1, carries a signature GitHub verified.
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Openfire
✓ signed The latest release, v5.1.2, carries a signature GitHub verified.
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