What is the difference between Lark and Zulip?

Lark is best for Teams wanting an all-in-one collaboration suite, while Zulip is best for Open-source communities and teams wanting threaded messaging. Lark starts at Free and Zulip starts at Free.

Is Lark or Zulip cheaper?

Lark starts at Free with a free tier. Zulip starts at Free and is free.

Is there a free alternative to Zulip?

Both Lark and Zulip offer free tiers.

Lark vs Zulip

Lark is integrated workspace combining messaging, video, docs, and project management from ByteDance, while Zulip is open-source team chat with a unique topic-based threading model for organized conversations. Zulip is open source and can be self-hosted, giving you full control over your data. Lark is built for teams wanting an all-in-one collaboration suite, whereas Zulip targets open-source communities and teams wanting threaded messaging.

At a glance

	Lark	Zulip
Best for	Teams wanting an all-in-one collaboration suite	Open-source communities and teams wanting threaded messaging
Starting price	Free	Free
Free tier	✓	✓
Open source	—	✓
Free tier available	✓	✓
Open source	—	✓
Calendar	✓	—
Docs	✓	—
Markdown	—	✓
Messenger	✓	—
OKRs	✓	—
Open Source	—	✓
Self-Hosted	—	✓
Topic Threading	—	✓
Video	✓	—

Lark

Strengths

Includes Messenger as a core feature, purpose-built for team communication workflows
Includes Video as a core feature, purpose-built for team communication workflows
Free for up to 50 users — generous enough for most small teams to get real work done
Includes docs alongside the core feature set — fewer separate tools needed

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Feature-rich interface takes time to learn — not the simplest option for quick adoption
Notification overload is a real problem as the number of channels grows
Mobile experience lags behind the desktop version in features and polish

Try Lark → 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 Lark and Zulip are free. You can try both without spending a dollar.

Feature gaps: Lark offers Calendar, Docs and Messenger that Zulip lacks. Zulip brings Markdown, Open Source and Self-Hosted that Lark does not have.

Team fit: Both tools target any size teams, so the decision hinges on features and workflow fit rather than scale.

Open source: Zulip is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. Lark is proprietary — you are trusting the vendor with your data and uptime.

Where each tool shines: Lark's biggest strengths are: includes messenger as a core feature, purpose-built for team communication workflows. includes video as a core feature, purpose-built for team communication workflows. Zulip's biggest strengths are: open source and transparent. topic-based threading keeps conversations organized by subject, not just time.

Watch out for: With Lark, users commonly note that free plan exists but key features are locked behind the paid upgrade. With Zulip, the main complaint is that may lack some advanced features.

Choose Lark if...

Your profile matches its sweet spot: teams wanting an all-in-one collaboration suite
You specifically need Calendar and Docs
You care about includes video as a core feature, purpose-built for team communication workflows
The free tier works for you: free for up to 50 users

Choose Zulip if...

You need a tool built for open-source communities and teams wanting threaded messaging
You need self-hosting, data sovereignty, or the ability to audit source code
You specifically need Markdown and Open Source
You care about topic-based threading keeps conversations organized by subject, not just time