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MongooseIM vs Synapse

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

MongooseIMSynapse
LanguageErlangPython
LicenceOtherAGPL-3.0
Stars1.8k4.7k
Latest6.9.0v1.162.0
Last push2026-10-012026-10-06
Release cadenceabout 38 days between releasesabout 13 days between releases
Active contributors9 commit authors on the default branch in the last 90 days38 commit authors on the default branch in the last 90 days
Flagsnonenone

How they relate

  • Both replace Slack. Alternatives to Slack →

    PartialMongooseIMA clustered XMPP server built for large deployments; teams chat through an XMPP client.

    PartialSynapseA Matrix homeserver; teams chat through a client such as Element, and can federate with other servers.