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Technology · head to head

Postman vs Slab

Postman logo

Postman

Technology

The API platform for building and using APIs

From
Free
Rated
-
Full reviewWebsite
Slab logo

Slab

Documentation

Internal knowledge base for teams, organised by topic rather than folders, with search across connected tools

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Postman free plan limited to single user as of March 1, 2026, making it unsuitable for teams without paid plans; Slab it is built for internal knowledge, so public product documentation on a custom domain with versioning is outside what the product does.
  • They diverge on capability: Postman covers API client, Slab covers Topics instead of folders.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Postman and Slab actually diverge.

Attributes where Postman and Slab differ
AttributePostmanSlab
Pricing modelUnknownPer user per month
PlatformsWeb, Windows, macOS, LinuxWeb
CategoryTechnologyDocumentation
Founded2014Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Postman

  • API client
  • Automated testing
  • Mock servers
  • Documentation
  • Monitors
  • Workspaces
  • Version control
  • API design

Only in Slab

  • Topics instead of folders
  • Unified search
  • Post verification
  • Quill editor
  • Permissions
  • Free tier for small teams

What people use each for

The jobs each tool is most often brought in to do.

Postman

  • API testingnot Slab
  • API documentationnot Slab
  • API monitoringnot Slab
  • Team collaborationnot Slab
  • API developmentnot Slab

Slab

  • Building an employee handbook and onboarding path that new starters can actually findnot Postman
  • Replacing a folder-based wiki where nobody agrees which folder a document belongs innot Postman
  • Companies whose knowledge is already spread across Drive, Slack and GitHub and needs one search boxnot Postman
  • Documenting process and decisions for teams that do not want a project management tool attachednot Postman

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Postman

  • Free plan limited to single user as of March 1, 2026, making it unsuitable for teams without paid plans
  • Only 25 collection runs per month and 1,000 API calls/month on free tier
  • Removed local-only Scratch Pad mode in 2023, forcing cloud account creation and sync
  • Requires Postman account and internet connection for most features
  • Cloud-first architecture with mandatory syncing to Postman's cloud servers
  • No CI/CD integration or advanced security features on free plan

Slab

  • It is built for internal knowledge, so public product documentation on a custom domain with versioning is outside what the product does.
  • There is no docs-as-code workflow, no git synchronisation and no markdown files on disk, so engineering-owned technical documentation ends up somewhere else anyway.
  • Hierarchy is shallow by design, and organisations that genuinely need deep nested structure find topics an awkward substitute rather than an improvement.
  • There is no offline mode, so a knowledge base that includes incident runbooks is unavailable during exactly the incident where the network is the problem.
  • Pricing is per user per month, so organisations where most staff only read a handbook twice a year still pay a seat for each of them.

Pricing, plan by plan

Postman

Free
  • FreeFree
    • 1 user
    • 25 collection runs/month
    • 1,000 API calls/month
  • Team$14/month
    • Team collaboration
    • Shared workspaces
    • API mocking
  • Professional$29/month
    • Team features
    • Advanced security
    • SSO
  • Enterprise$49/month
    • Professional features
    • Custom integrations
    • Priority support

Slab

Free
  • FreeFree
    • Up to ten users
    • Unlimited posts
    • Core integrations
  • Slab$undefined/month
    • Priced per user per month with annual billing
    • Unlimited users and history
    • Full integration set and unified search

Which should you pick?

Choose Postman if

  • You need api client.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux.
  • You also want automated testing.
Postman review

Choose Slab if

  • You need topics instead of folders.
  • You want to start without paying.
  • You also want unified search.
Slab review

Questions people ask

Is Postman or Slab better?
Neither clearly leads. Postman starts at Free and Slab at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Postman or Slab?
Postman starts at Free and Slab at Free.
Does Postman or Slab run on more platforms?
Postman runs on Web, Windows, macOS, Linux. Slab runs on Web.
Can I use Postman for free?
Both have a free tier, so you can try either at no cost before committing.
What is Postman best used for?
Postman is most often used for api testing, api documentation, api monitoring, team collaboration. Of those, api testing and api documentation are not what Slab is typically brought in for.
What can Postman do that Slab cannot?
Postman covers API client, Automated testing, Mock servers, Documentation. Slab covers Topics instead of folders, Unified search, Post verification, Quill editor.

Answered from the vendors’ own pages

Postman: What is the cost of Postman?

Postman has a free plan limited to 1 user, 25 collection runs/month, 1,000 API calls/month. Team plans start at $14/user/month for Basic. Professional at $29/user/month, and Enterprise at $49/user/month.

Source
Slab: Can I publish documentation publicly with Slab?

Posts can be shared by link, but it is not a product documentation platform. There is no custom domain publishing, versioning or API reference tooling.

Postman: Can I use Postman offline?

Postman requires an internet connection to sync collections to the cloud. Since 2023, the Scratch Pad local-only mode was removed. Users must sign in with a Postman account, and collections sync to cloud by default. Offline work is possible but limited without cloud sync features.

Source
Slab: What does the free plan actually cover?

Up to ten users with unlimited posts and core integrations. It is a real free tier rather than a trial, and it is enough for a small company handbook.

Postman: Does Postman have team collaboration?

Team collaboration is not available on the free plan (limited to 1 user). Team plans start at $14/user/month and include shared workspaces, real-time collaboration, and team management features.

Source
Slab: How does it compare with a general workspace tool?

Slab does less on purpose. There are no databases, boards or task views, which makes it faster to write in and much harder to turn into an unmaintained sprawl.

Postman: What are the free plan limits?

Free plan allows: 1 user only, 25 collection runs per month, 1,000 API calls/month, and 1,000 mock server calls/month. No CI/CD integration or advanced security features.

Source
Slab: Does search really cover other tools?

Yes, connected sources are indexed and appear in results. That integration is the main reason to choose it, so verify your specific tools are supported before committing.

Postman: Does Postman work with other development tools?

Postman integrates with Git repositories, offers a Node.js runner (Newman) for automation, and connects with popular CI/CD platforms. Teams using git-native workflows may prefer alternatives like Bruno.

Source
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