Zulip — open source alternative

Threaded team chat with topics.

Strengths

  • Topic-based threading prevents channel noise.
  • Great for async and open-source communities.
  • Powerful search and history.

Weaknesses

  • Topic model has a learning curve.
  • Smaller ecosystem of third-party integrations.
  • UI feels less polished than Slack.
License: Apache-2.0 Self-host difficulty: 3/5 Hosted cloud optionDesktop: Windows, macOS, LinuxMobile: iOS, Android

Official site · Source on GitHub

Ad slot — OSS middle

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