Zulip — Communication

Zulip is an open-source team chat platform built around threaded conversations. Unlike linear chat apps, each message belongs to a topic, making it easy to follow discussions without noise. It solves the problem of chaotic, hard-to-search chat channels by giving every conversation a clear subject line and thread.

What it does

Messages are organized into streams (like channels) and topics (like threads). You can reply to a specific topic, and the conversation stays grouped for later reference. The search indexes everything, including file attachments and code snippets, so you can quickly find past decisions.

Best for

Zulip is ideal for engineering teams managing multiple projects, open-source communities that need transparent archived discussions, and remote teams relying on async communication across time zones. It is less suited for organizations that prefer real-time, linear chat without structured threading.

Real use cases

Companies like iDrift AS use Zulip for efficient distributed team management; GUT contact uses it for easy communication among 1000 agents; and the Rust language community relies on it for faster decision-making. Zulip is also widely adopted in education and research, such as at TUM and UCSD, where it supports thousands of students.

• Threaded topics — Every message belongs to a topic for clean organization and async focus
• 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 data control
• Mobile apps — iOS and Android with push notifications
• Guest accounts — Invite external collaborators with limited access

Zulip pricing: Free · from $6.67/mo. Billing model: Freemium.

Free

10,000 messages of search history, 5 GB total file storage, complete team chat solution, hundreds of integrations, advanced roles and permissions, guest accounts. Many organizations are eligible for a free Standard plan.

Standard ($6.67/user/month billed annually, or $8 billed monthly)

Unlimited search history, 5 GB per user file storage, flexible permissions with custom groups, message retention policies, brand Zulip with your logo, priority commercial support, public access option.

Plus ($10/user/month billed annually, or $12 billed monthly — 10 users minimum)

All Standard plan features, 25 GB per user file storage, SSO with SAML (Okta, OneLogIn, etc.), SCIM user and group sync, custom domain, limit user list access for guests, priority commercial support.

Self-hosted

100% open-source software. Free with all Zulip features included. Mobile notifications without limitation for eligible communities (grassroots, open-source, academic research, small non-profits, non-profit events, families & friends); up to 10 users for other organizations.

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