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Self-hosted alternatives to Slack

Entries in our catalogue that can take over from Slack. Each one states why, and links the vendor's own source for the claim.

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  Zulip

  Open-source team chat with topic-based threading, self-hosted on your own Ubuntu or Debian server.

  Team Chat

  Free self-hostedOpen source · Apache License 2.0

  Also offers paid editions — see the detail.

  13 Sept 2026★ 25,885Source ↗

  Why it can replace Slack: Zulip's own why-Zulip page names Slack and argues its topic-based threading is more efficient than Slack's channel model. Source

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