Chat platforms are sticky because of the network effect, not the tech. Switching is easier than it looks.

Zulip is one of the leading open-source alternatives to Slack in the messaging category.

Why consider the swap

If you currently rely on Slack and want more control over data, lower long-term costs, or a open-source licensing model, Zulip covers most of the same ground.

What you trade off

Most open-source alternatives require more setup than their commercial counterparts and may lag on polish, mobile apps, or ecosystem integrations. Check the project’s documentation for current feature parity with Slack before committing.

Where to start

• Project page: Zulip
• Comparison reference: Slack

This recommendation is indexed from awesome-oss-alternatives. Read their full project notes for the latest changes.