Zulip vs Rocket.Chat
Both are alternatives to Slack. Here's how they stack up — verified facts, no spin.
Also searched as Rocket.Chat vs Zulip — same comparison, one verdict.
Zulip and Rocket.Chat are closely matched on ownership (88 vs 85) — this one comes down to pricing and to which trade-offs below you can live with.
Zulip
Threaded team chat that keeps conversations organized.
Zulip is an Apache-2.0 open-source chat app whose topic-based threading model keeps busy teams' discussions searchable and organized. Self-host it or use the hosted option.
Rocket.Chat
MIT-licensed, highly customizable team communication.
Rocket.Chat is a permissively licensed (MIT) open-source communications platform you can self-host and reshape freely, with chat, voice, and omnichannel features.
Side by side
10 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| Zulip | Rocket.Chat | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 88 | 85 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | Apache-2.0 | MIT |
| Pricing | Free self-host; paid cloud | Free self-host; paid cloud/enterprise |
| RAM to run it wellThe figure that actually matters, not the vendor's minimum. | 4 GB for a small organisation | 6 GB with MongoDB on the same machine |
| Realistic running costWhat the box costs each month if you run it yourself. | $25–40/mo | $35–55/mo for a small team |
| Setup timeHonest first-install estimate, not the marketing quickstart. | 1 hour — the installer is unusually good | 2–3 hours |
| Ongoing maintenanceThe part nobody budgets for. | Low. The upgrade path is a single documented command. | Active. MongoDB version compatibility is the recurring chore. |
Zulip edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on Slack? Is Slack free? What it actually costs →
Zulip
Strengths
- +Excellent threading model
- +Permissive Apache-2.0 license
- +Great for async teams
Trade-offs
- −Threading is a mental-model shift
- −Smaller ecosystem than Slack
Rocket.Chat
Strengths
- +Permissive MIT license
- +Very customizable and extensible
- +Omnichannel features
Trade-offs
- −Broad feature set can feel heavy
- −Some capabilities gated to paid tiers
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose Zulip
if a lower exit cost matters more to you than any single feature, and excellent threading model.
Choose Rocket.Chat
if permissive MIT license.
Neither, yet
if both carry a real cost you should weigh first — threading is a mental-model shift, and broad feature set can feel heavy. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
What it takes to run these yourself
Real requirements and honest running costs, not the vendor quickstart.
Zulip vs Rocket.Chat — common questions
Is Zulip a better fit than Rocket.Chat for team chat?
It depends on what you are optimising for, and the honest split is this: Zulip scores 88 to Rocket.Chat's 85 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Rocket.Chat earns its place on a different axis — permissive MIT license. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
Zulip keeps its data local or in open formats, so leaving is an export rather than a negotiation. Rocket.Chat is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host Zulip or Rocket.Chat?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are Zulip and Rocket.Chat both alternatives to Slack?
Yes — both appear in our Slack comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Slack and now choosing between the two replacements, which is a narrower and much easier question.
More Slack head-to-heads
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Facts verified 2026-07-04. Licenses and pricing change — spotted something out of date? That's a correction we want.