Zulip

Open-source alternative to Slack and Microsoft Teams. Threaded team chat that keeps long-running technical conversations organized by topic.

Better than channel-only chat when teams need to recover decisions weeks later.

At a glance

ReplacesSlack, Microsoft Teams
Open-source licenseApache-2.0
PrivacySelf-hosting is supported with clear data ownership.
Lightweight signalTopic-based streams reduce notification and channel overload.
Community healthMature open-source organization
PlatformsWeb, Windows, macOS, Linux, Android, iOS
Privacy advantage

Self-hosting is supported with clear data ownership.

Less bloat

Topic-based streams reduce notification and channel overload.

Trust signal

Mature open-source organization. Verify current releases and open issues in the source repository before critical deployment.

Should you switch to Zulip?

Better than channel-only chat when teams need to recover decisions weeks later. A successful migration starts with a small real project, not a feature checklist. Test the files, integrations, shortcuts, and collaboration steps you use every week before removing the existing tool.

Open source gives you inspectable code and a path away from vendor lock-in, but it does not eliminate tradeoffs. Support may be community-led, some commercial file formats may be imperfect, and self-hosted options require security updates and backups. Use the official website and source repository above to confirm current compatibility.

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