compare
Mattermost vs Synapse
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Mattermost | Synapse |
|---|---|---|
| Language | TypeScript | Python |
| Licence | Other | AGPL-3.0 |
| Stars | 39k | 4.7k |
| Latest | v11.11.1 | v1.162.0 |
| Last push | 2026-10-06 | 2026-10-06 |
| Release cadence | too few releases | about 13 days between releases |
| Active contributors | 50+ commit authors on the default branch in the last 90 days | 38 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace Microsoft Teams. Alternatives to Microsoft Teams →
PartialMattermostChat and calls on your own server, without the Microsoft 365 integration.
PartialSynapseChat only, through a Matrix client.
Both replace Slack. Alternatives to Slack →
Full replacementMattermostChannels, threads and calls on your own server, with an importer for Slack exports.
PartialSynapseA Matrix homeserver; teams chat through a client such as Element, and can federate with other servers.
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
Synapse
- v1.162.02026-09-29
- v1.162.0rc12026-09-22pre-release
- v1.161.02026-09-15
- v1.161.0rc12026-09-09pre-release
- v1.160.02026-09-02
Mattermost
✓ signed The latest release, v11.11.1, carries a signature GitHub verified.
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Synapse
✓ signed The latest release, v1.162.0, carries a signature GitHub verified.
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