Comparison

Slack vs Zulip

Compare the facts. Check the scope. Choose what fits.

Documented differences: 0
Same documented value: 5
Need more evidence: 1

Collaboration

Slack

21% Research progress

Kandra Labs, Inc.

Zulip

25% Research progress

Change products Explore the evidence Share card (SVG) API

At a glance

Differences, not an overall ranking

The comparable values we have documented are the same. Open research gaps before drawing a conclusion.

Explore the evidence

Open a row for sources and plan limits

Which criteria should be shown? Documented 5 Differences 0 Research gaps 1 All 6

No differences are documented on both sides yet. Check the research gaps or select All.

Pricing

Free tier

Yes

Slack

Verified71% confidence Slack Free provides access to the most recent 90 days of message and file history. The documentation says data older than one year is deleted; free and paid retention differ.

Yes

Zulip

Verified71% confidence Zulip Cloud Free includes a limited searchable history of 10,000 messages and 5 GB total file storage. Paid plans and self-hosted notification terms differ.

Same value

Sources for this row

Slack:

Slack Free provides access to the most recent 90 days of message and file history. The documentation says data older than one year is deleted; free and paid retention differ.

Feature limitations on the free version of Slack | Slack (Primary documentation), retrieved 2026-10-03

Zulip:

Zulip Cloud Free includes a limited searchable history of 10,000 messages and 5 GB total file storage. Paid plans and self-hosted notification terms differ.

Plans and pricing | Zulip (Primary documentation), retrieved 2026-10-03

Platform and integration

Public API

Yes

Slack

Verified71% confidence Slack documents a Web API. Each method has its own scopes, token requirements and rate limits; API access does not imply unrestricted access to workspace content.

Yes

Zulip

Verified71% confidence Zulip documents a REST API for integrations, including message operations. Authentication and endpoint permissions apply.

Same value

Sources for this row

Slack:

Slack documents a Web API. Each method has its own scopes, token requirements and rate limits; API access does not imply unrestricted access to workspace content.

Slack Web API | Slack Developer Docs (Primary documentation), retrieved 2026-10-03

Zulip:

Zulip documents a REST API for integrations, including message operations. Authentication and endpoint permissions apply.

Zulip API documentation (Primary documentation), retrieved 2026-10-03

Data export

Yes

Slack

Verified71% confidence Standard exports include public-channel messages and file links in JSON. Private conversations need additional eligibility or approval; Free exports only include file links from the last 90 days.

Yes

Zulip

Verified71% confidence Zulip documents export and import tools for moving between cloud hosting and an own-server deployment. Check permissions and included content before migration.

Same value

Sources for this row

Slack:

Standard exports include public-channel messages and file links in JSON. Private conversations need additional eligibility or approval; Free exports only include file links from the last 90 days.

Export your workspace data | Slack (Primary documentation), retrieved 2026-10-03

Zulip:

Zulip documents export and import tools for moving between cloud hosting and an own-server deployment. Check permissions and included content before migration.

Plans and pricing | Zulip (Primary documentation), retrieved 2026-10-03

On-premises or self-hosted option

Not researched

Slack

Not yet verified

Yes

Zulip

Verified71% confidence Zulip documents a self-hosted deployment. Operators are responsible for their infrastructure; support and mobile notification plans have separate terms.

Needs more evidence

Sources for this row

Zulip:

Zulip documents a self-hosted deployment. Operators are responsible for their infrastructure; support and mobile notification plans have separate terms.

Plans and pricing | Zulip (Primary documentation), retrieved 2026-10-03

SCIM user provisioning

Yes

Slack

Verified71% confidence Slack documents SCIM provisioning alongside SSO setup. Availability and identity-provider configuration must be checked for the intended plan.

Yes

Zulip

Verified71% confidence The Cloud Plus plan lists SCIM user and group synchronisation, with a 10-user minimum.

Same value

Sources for this row

Slack:

Slack documents SCIM provisioning alongside SSO setup. Availability and identity-provider configuration must be checked for the intended plan.

Set up SAML single sign-on for Slack | Slack (Primary documentation), retrieved 2026-10-03

Zulip:

The Cloud Plus plan lists SCIM user and group synchronisation, with a 10-user minimum.

Plans and pricing | Zulip (Primary documentation), retrieved 2026-10-03

Single sign-on

Yes

Slack

Verified71% confidence SAML SSO is documented for Business+ and Enterprise, and for Free and Pro when a Salesforce organisation is connected. Check account eligibility.

Yes

Zulip

Verified71% confidence The Cloud Plus plan lists SAML SSO and has a 10-user minimum. This is not a statement that Cloud Free includes SAML.

Same value

Sources for this row

Slack:

SAML SSO is documented for Business+ and Enterprise, and for Free and Pro when a Salesforce organisation is connected. Check account eligibility.

Set up SAML single sign-on for Slack | Slack (Primary documentation), retrieved 2026-10-03

Zulip:

The Cloud Plus plan lists SAML SSO and has a 10-user minimum. This is not a statement that Cloud Free includes SAML.

Plans and pricing | Zulip (Primary documentation), retrieved 2026-10-03

A missing measurement never counts against a product. If we could not reach a document, that is a fact about our research and not about the vendor. Open a row to see the source, its tier and the day we read it.