Zulip

Communication Free · from $6.67/mo

About Zulip

Zulip is an open-source team chat app built around threaded conversations. Each message belongs to a topic, so you can follow discussions without noise. It's designed for teams that want structured, asynchronous communication.

What it does

Messages are organized by stream (like channels) and topic (like threads). You can reply to a specific topic, and the conversation stays grouped. The search indexes everything, including file attachments and code snippets.

Best for

Engineering teams managing multiple projects simultaneously
Open-source communities needing transparent, archived discussions
Remote teams that rely on async communication across time zones

Strengths

Threaded topics keep conversations organized and reduce noise
Open-source with self-hosting option for full data control
Powerful search across all messages, files, and code

Key features

Threaded topics — Every message belongs to a topic for clean organization
Streams — Create channels for teams, projects, or topics
Full-text search — Indexes messages, files, and code snippets
Integrations — GitHub, GitLab, Jira, Jenkins, and 100+ others
Self-hosting — Deploy on your own server with full control
Mobile apps — iOS and Android with push notifications

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