What is the difference between Rocket.Chat and Zulip?

Rocket.Chat is best for Teams that want self-hosted chat with customer-facing features, while Zulip is best for Open-source communities and teams wanting threaded messaging. Rocket.Chat starts at Free (self-hosted) and Zulip starts at Free.

Is Rocket.Chat or Zulip cheaper?

Rocket.Chat starts at Free (self-hosted) and is free. Zulip starts at Free and is free.

Is there a free alternative to Zulip?

Both Rocket.Chat and Zulip offer free tiers.

Rocket.Chat vs Zulip

Rocket.Chat is open-source communication platform with team chat, video, and omnichannel customer engagement, while Zulip is open-source team chat with a unique topic-based threading model for organized conversations. Rocket.Chat is built for teams that want self-hosted chat with customer-facing features, whereas Zulip targets open-source communities and teams wanting threaded messaging.

At a glance

	Rocket.Chat	Zulip
Best for	Teams that want self-hosted chat with customer-facing features	Open-source communities and teams wanting threaded messaging
Starting price	Free (self-hosted)	Free
Free tier	✓	✓
Open source	✓	✓
Free tier available	✓	✓
Open source	✓	✓
Bots	✓	—
Federation	✓	—
Markdown	—	✓
Omnichannel	✓	—
Open Source	—	✓
Self-Hosted	✓	✓
Topic Threading	—	✓
Video Calls	✓	—

Rocket.Chat

Strengths

Self-hosted with full data ownership
Combines internal chat and customer-facing messaging
Active open-source community
Federation support for cross-organization chat

Weaknesses

UI feels dated compared to Slack
Self-hosting requires significant DevOps effort
Fewer integrations than mainstream alternatives
Can be resource-intensive to run

Try Rocket.Chat → Full review

Zulip

Strengths

Open source and transparent
Topic-based threading keeps conversations organized by subject, not just time
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
The core product is free with no paywalled essentials

Weaknesses

May lack some advanced features
Self-hosting is free but requires server maintenance and DevOps knowledge
Self-hosting requires Linux admin skills and ongoing server maintenance
Notification overload is a real problem as the number of channels grows

Try Zulip → Full review

The bottom line

Pricing: Both Rocket.Chat and Zulip are free, so this decision comes down to features and philosophy rather than budget.

Feature gaps: Rocket.Chat offers Bots, Federation and Omnichannel that Zulip lacks. Zulip brings Markdown, Open Source and Topic Threading that Rocket.Chat does not have. Both share Self-Hosted.

Team fit: Rocket.Chat is geared toward mid-size teams teams, while Zulip is aimed at any size teams. Pick the one that matches where your team is today and where it is headed — migrating tools later is always painful.

Open source: Both Rocket.Chat and Zulip are open source, so self-hosting and code audits are on the table with either choice.

Where each tool shines: Rocket.Chat's biggest strengths are: self-hosted with full data ownership. combines internal chat and customer-facing messaging. Zulip's biggest strengths are: open source and transparent. topic-based threading keeps conversations organized by subject, not just time.

Watch out for: With Rocket.Chat, users commonly note that ui feels dated compared to slack. With Zulip, the main complaint is that may lack some advanced features.

Choose Rocket.Chat if...

Your profile matches its sweet spot: teams that want self-hosted chat with customer-facing features
You specifically need Bots and Federation
You care about combines internal chat and customer-facing messaging
Your team size fits the mid-size teams profile Rocket.Chat is designed for

Choose Zulip if...

You need a tool built for open-source communities and teams wanting threaded messaging
You specifically need Markdown and Open Source
You care about topic-based threading keeps conversations organized by subject, not just time
Your team size fits the any size profile Zulip is designed for