# Zulip

Open-source, thread-based team chat — free to self-host with every feature included, or a managed Zulip Cloud plan with a real free tier.

- **Category:** [Utilities](https://notchlist.vercel.app/category/utilities/)
- **Price:** Free (Zulip Cloud: 10,000 messages of history, 5GB storage; self-hosted: every feature, unlimited history, no cost); paid Cloud and self-hosted tiers exist but list no public per-seat price on the official pricing page
- **Open source:** yes
- **Official site:** https://zulip.com/
- **Available via:** Homebrew, Direct
- **Requirements:** macOS 12 or newer, Apple Silicon or Intel, per the Homebrew cask (separate per-architecture builds listed).
- **Maker:** Kandra Labs, Inc.

## Kitsmith's take

Zulip’s own case studies make the comparison explicit — one is titled “More efficient communication than Slack at Semsee” — and its pitch is unique among the Slack alternatives here: full topic-threading within channels, so parallel conversations do not collapse into one firehose feed. It is also the most transparently open of the group, 100% open source on GitHub with a genuinely complete self-hosted edition that costs nothing at any team size. The catch for a small Mac-using team: Zulip Cloud’s paid Standard/Plus/Business tiers (unlimited history, SSO, priority support) list no public per-seat price on the current pricing page — sales must be contacted for a number.

## Features

- **Topic-threading inside channels:** Every message belongs to a named topic within a channel, so several conversations can run in parallel without burying each other.
- **Fully open source:** The complete codebase is public on GitHub (zulip/zulip); the self-hosted edition ships with every feature at no cost.
- **Move freely between Cloud and self-hosted:** Zulip’s own export/import tools let an organization migrate between managed Cloud hosting and a self-hosted server.

## FAQ

**Is Zulip really free?**

Yes, two ways — Zulip Cloud’s Free plan (10,000 messages of history, 5GB storage) costs nothing, and the self-hosted edition is 100% open source with every feature included and no per-user charge.

**Who makes Zulip?**

Kandra Labs, Inc., founded by Tim Abbott in 2016 to steward Zulip’s development, per Zulip’s own project-history page. The codebase itself is open source on GitHub.

**How is Zulip different from Slack?**

Its own customer case studies frame it as a more efficient alternative, built around topic-threading inside channels so parallel conversations stay organized instead of one continuous feed per channel.


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Hand-verified listing on Kitsmith: https://notchlist.vercel.app/apps/zulip/