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Home/Categories/Communication & Collaboration/Zulip
icon of Zulip

Zulip

Open source alternative to Slack, Microsoft Teams and Google Workspace (Google Chat)

An organized team chat app designed for distributed teams, offering features like threaded conversations and powerful search.

25.2K stars
Python
Apache-2.0
Active this month
Visit websiteGitHub repo
image of Zulip
Contents
  1. 01Who Zulip is for
  2. 02The problem it solves
  3. 03How it solves it
  4. 04Strengths and trade-offs
  5. 05Zulip vs alternatives
  6. 06Tech stack
  7. 07FAQ
  8. 08Similar open-source tools
TL;DR

Zulip is an Apache-2.0 team chat platform built around topic-based threads inside streams. It replaces Slack or Microsoft Teams for distributed teams that need searchable, long-running discussions without losing context in a single channel feed. Teams can use Zulip Cloud or run the open source server themselves when message history and integration control matter.Apache-2.0 · Python · 25.2K stars · Active this month

who it's for

Who Zulip is for#

Remote engineering teams coordinating decisions

Zulip keeps architecture, incident, release, and support conversations separated by topic while still living in shared team streams.

Skip if:

Your team mainly uses chat for quick social coordination and does not want to enforce topic naming.

Open source communities with public support channels

Maintainers can point contributors to focused topics and keep answers discoverable across time zones.

Skip if:

Your community depends heavily on voice rooms, live events, or broad consumer familiarity with Discord.

the problem
tech stack · detected from GitHub

What it's built on#

Languages
JavaScriptPythonTypeScript
Tooling
Webpack
frequently asked

FAQ#

Is Zulip open source?
Can Zulip replace Slack?
Can I self-host Zulip?
also worth a look

Similar open-source tools#

Rocket.Chat

Rocket.Chat

Self-hosted team chat with voice, video, and omnichannel support

45.3KTypeScriptMIT

Repository

Stars
25.2K
Forks
9.8K
License
Apache-2.0
Latest
12.0
Last commit
22 days ago
Last verified
May 13, 2026
Repo
zulip/zulip ↗

Additional details

Language
Python
Open issues
2,068
Contributors
1,309
First release
2015

Categories

Communication & CollaborationBusiness & ProductivityIT Management

Tags

ChatOpen CoreSelf HostedFile SharingKnowledge ManagementProject Management

The problem it solves#

how Zulip solves it

How it solves it#

Topic-based conversations

Every stream message belongs to a topic, so multiple discussions can happen in the same team space without mixing decisions, questions, and status updates.

Self-hosted server option

Zulip publishes its server code under Apache-2.0, giving teams a path to run chat on their own infrastructure instead of keeping all history in a proprietary SaaS account.

Developer-focused integrations

The project documents integrations, bots, webhooks, and an API so engineering teams can connect deployments, CI alerts, issue trackers, and custom workflows to chat.

Cross-platform clients

Official web, desktop, and mobile clients let teams keep the same threaded conversation model across laptops and phones.

strengths · trade-offs

Strengths and trade-offs#

Strengths

  • Better async structure than channel-only chatTopic threads make Zulip easier to scan after time away than Slack-style channels where unrelated conversations interleave chronologically.
  • Apache-2.0 licensingThe permissive license supports internal modification and commercial use without the network-copyleft obligations that some team chat platforms carry.

Trade-offs

  • -Different mental modelTeams used to casual channel chat need to adopt topic hygiene. Without that habit, Zulip loses much of its advantage over Slack or Discord.
  • -Self-hosting is an operations commitmentRunning the server means maintaining databases, email delivery, backups, upgrades, and push notification configuration instead of delegating that work to Zulip Cloud.
versus alternatives

Zulip vs alternatives#

Prose

Prose

Decentralized open source workplace with chat and docs

36RustMPL-2.0
Adapt

Adapt

Lightweight self-hosted messaging platform for teams

1AGPL-3.0
SpacebarChat

SpacebarChat

Free open source Discord reimplementation with full API parity

2.1KTypeScriptAGPL-3.0
Converse.js

Converse.js

Self-hosted web-based XMPP chat client for any server

3.3KJavaScriptMPL-2.0
Revolt

Revolt

Self-hosted open source Discord alternative with servers

2.3K

Yes. Zulip Server is open source under the Apache-2.0 license, with official clients and integrations available through the Zulip project.

Zulip can replace Slack for teams that value threaded async discussion, searchable history, and self-hosting. Slack remains stronger for teams that rely on a large app marketplace and familiar channel-first workflows.

Fast chat tools work well for live coordination, but they turn messy when a team discusses several decisions in the same channel. Important answers get buried between status updates, newcomers have to read long scrollback, and remote teams repeat the same questions because no one can find the thread that settled the issue.

The pain gets sharper for open source communities, research groups, and engineering teams with members across time zones. They need asynchronous discussion that stays organized by topic, not just a searchable stream of every message ever sent.

Zulip vs Slack

Zulip and Slack both handle team chat, integrations, mentions, and searchable history. The main difference is conversation structure: Zulip requires topics inside streams, while Slack centers channels and optional threads.

CriteriaZulipSlack
LicenseApache-2.0 serverProprietary
Self-hostingYesNo
Conversation modelTopic-first streamsChannel-first messages
Best fitAsync teams and communitiesTeams that want the largest SaaS chat ecosystem

Zulip is the better choice when async discussion quality matters more than SaaS familiarity. Slack is still the better fit when your organization depends on Slack-native apps, enterprise administration, or users who will resist a topic-first workflow.

Yes. Zulip provides a self-hosted server path, but production operation requires normal chat infrastructure work such as email, backups, upgrades, and push notification setup.