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Documentation · head to head

ReadMe vs Swagger UI

ReadMe logo

ReadMe

Documentation

Hosted developer hub priced per API project, with docs personalised from live request logs

From
Free
Rated
-
Full reviewWebsite
Swagger UI logo

Swagger UI

Developer Tools

Interactive API documentation generated from OpenAPI specs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ReadMe pricing is per project, so an organisation with several distinct APIs multiplies the monthly bill rather than adding seats, and the sensible workaround, merging unrelated APIs into one documentation project, distorts the information architecture to fit the invoice.; Swagger UI only as good as the specification: a thin OpenAPI file produces thin documentation
  • They diverge on capability: ReadMe covers OpenAPI reference, Swagger UI covers OpenAPI rendering.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which ReadMe and Swagger UI actually diverge.

Attributes where ReadMe and Swagger UI differ
AttributeReadMeSwagger UI
Pricing modelPer project per monthOpen source, no licence fee
PlatformsWebWeb, Self-hosted, Docker
CategoryDocumentationDeveloper Tools

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 ReadMe

  • OpenAPI reference
  • Try It playground
  • API metrics
  • Personalised docs
  • Versioning
  • Guides and recipes
  • Git sync via rdme
  • Changelog and support widget

Only in Swagger UI

  • OpenAPI rendering
  • Try it out
  • Schema display
  • Self-hostable

What people use each for

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

ReadMe

  • Publishing a public API reference where a developer can send a live request with their own key from the documentation pagenot Swagger UI
  • Cutting support load by showing an integrating developer their own recent failing requests next to the endpoint descriptionnot Swagger UI
  • Keeping documentation versions aligned with API versions so customers on an older release read the matching referencenot Swagger UI
  • Shipping documentation from the same pull request as the code change using the rdme command line tool in CInot Swagger UI

Swagger UI

  • Publishing API documentation that stays in step with the specificationnot ReadMe
  • Letting developers try endpoints before writing any client codenot ReadMe
  • Internal API discovery across teamsnot ReadMe

Where each one falls short

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

ReadMe

  • Pricing is per project, so an organisation with several distinct APIs multiplies the monthly bill rather than adding seats, and the sensible workaround, merging unrelated APIs into one documentation project, distorts the information architecture to fit the invoice.
  • The metrics and personalisation features require your API to stream request logs to ReadMe, which means production request metadata leaves your infrastructure and needs a scrubbing layer plus a security review before anything is switched on.
  • Single sign-on and private documentation sit on the higher tier, so a company that only needs to gate partner documentation behind SAML pays a large step up for one control.
  • The platform is built for describing REST APIs, and long-form product manuals, internal knowledge bases or non-OpenAPI protocols fit it badly, so most customers end up running a second documentation tool alongside it.
  • Theming is bounded by ReadMe templates and limited custom CSS, so a documentation site that must match a strongly designed marketing site will not get there without compromise.
  • Content uses ReadMe-specific Markdown extensions and platform features, so migrating away is an export plus a rewrite rather than moving a folder of Markdown files.

Swagger UI

  • Only as good as the specification: a thin OpenAPI file produces thin documentation
  • Default presentation is dated compared with modern documentation tools
  • Large specifications render slowly and become hard to navigate
  • Try it out against production needs care with authentication and CORS, and is often disabled as a result

Pricing, plan by plan

ReadMe

Free
  • FreeFree
    • One project on a ReadMe subdomain
    • OpenAPI reference and guides
    • Basic editing and publishing
  • Startup$99/month
    • One project
    • Custom domain
    • API metrics from request logs
  • Business$399/month
    • One project
    • SAML single sign-on
    • Private and partner-only documentation
  • Enterprise$undefined/year
    • Multiple projects under one contract
    • Negotiated support and uptime terms
    • Security review and custom deployment questions

Swagger UI

Free
  • Swagger UIFree
    • Full functionality
    • Commercial use permitted
    • Community support

Which should you pick?

Choose ReadMe if

  • You need openapi reference.
  • You want to start without paying.
  • You also want try it playground.
ReadMe review

Choose Swagger UI if

  • You need openapi rendering.
  • You want to start without paying.
  • You work on Web, Self-hosted, Docker.
  • You also want try it out.
Swagger UI review

Questions people ask

Is ReadMe or Swagger UI better?
Neither clearly leads. ReadMe starts at Free and Swagger UI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ReadMe or Swagger UI?
ReadMe starts at Free and Swagger UI at Free.
Does ReadMe or Swagger UI run on more platforms?
ReadMe runs on Web. Swagger UI runs on Web, Self-hosted, Docker.
Can I use ReadMe for free?
Both have a free tier, so you can try either at no cost before committing.
What is ReadMe best used for?
ReadMe is most often used for publishing a public api reference where a developer can send a live request with their own key from the documentation page, cutting support load by showing an integrating developer their own recent failing requests next to the endpoint description, keeping documentation versions aligned with api versions so customers on an older release read the matching reference, shipping documentation from the same pull request as the code change using the rdme command line tool in ci. Of those, publishing a public api reference where a developer can send a live request with their own key from the documentation page and cutting support load by showing an integrating developer their own recent failing requests next to the endpoint description are not what Swagger UI is typically brought in for.
What can ReadMe do that Swagger UI cannot?
ReadMe covers OpenAPI reference, Try It playground, API metrics, Personalised docs. Swagger UI covers OpenAPI rendering, Try it out, Schema display, Self-hostable.

Answered from the vendors’ own pages

ReadMe: Is ReadMe priced per user?

No. It is priced per project, meaning per documented API. Team size does not change the bill, and a second API generally does.

Swagger UI: Is Swagger UI free?

Yes, open source under the Apache 2.0 licence. SmartBear sells commercial SwaggerHub separately.

ReadMe: Do I have to send my API logs to ReadMe?

Only for metrics and personalised documentation. The reference, guides and playground work without it, but the features that most distinguish the product are the ones that need the log stream.

Swagger UI: What is the difference between Swagger and OpenAPI?

OpenAPI is the specification format; Swagger is the toolset around it, including Swagger UI. The specification was renamed from Swagger to OpenAPI in 2016.

ReadMe: Can I keep documentation in Git?

Yes. The rdme command line tool synchronises Markdown and OpenAPI files from a repository, so documentation can ship in the same pull request as the code.

Swagger UI: Can Swagger UI make real API calls?

Yes, through its try-it-out control, though authentication and CORS configuration often mean it is disabled for production APIs.

ReadMe: Can I self-host it?

No. ReadMe is a hosted product only, so buyers with a hard on-premises requirement need a different platform.

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