APIDocGen vs. Postman, Swagger, and Redocly: what's the difference

The short version

These tools solve different problems, and the right one depends on how much spec work you already do.

Swagger / OpenAPI — a spec-first standard. You describe the API in OpenAPI, then generate docs, mocks, and client SDKs.
Redocly — turns an OpenAPI spec into hosted, branded documentation.
Postman — collections of real requests you send, save, and share; docs are a byproduct of those requests.
APIDocGen — paste an endpoint list, get a Markdown reference with example requests and auth notes. No spec required.

Side-by-side

Tool	Input	Output	Best for
OpenAPI / Swagger	OpenAPI spec	Docs, mocks, SDKs	Teams standardizing on a spec
Redocly	OpenAPI spec	Hosted docs portal	Public developer portals
Postman	Request collections	Runnable requests	Testing and sharing real calls
APIDocGen	Endpoint list	Markdown reference	Quick internal docs from endpoints

Where APIDocGen fits

APIDocGen targets the case where you have endpoints and want a reference without adopting a full spec workflow. You paste METHOD path - description, pick curl / JS / Python, and get copy-ready Markdown. It is deliberately lighter than spec-first tooling.

Where the others fit better

If you already maintain an OpenAPI file, Redocly or Swagger UI will give you interactive docs and portals APIDocGen doesn't aim to replace. If your team lives in Postman, its collections may already cover what you need. APIDocGen is the "list in, Markdown out" option, not a portal or a spec validator.

An honest note

APIDocGen does not import OpenAPI files or validate a spec — it documents the endpoint list you paste. If spec validation or a hosted portal is the requirement, a spec-first tool is the more honest fit. Pick APIDocGen when the priority is speed and minimal input.

FAQ

When should I use APIDocGen instead of Swagger or OpenAPI?

Use APIDocGen when you have a list of endpoints and want Markdown docs quickly without maintaining an OpenAPI spec. If you already standardize on OpenAPI and want mocks, SDKs, or portals, Swagger/OpenAPI tooling is the better fit.

Does APIDocGen replace Postman?

No. Postman is for sending, saving, and sharing real requests; APIDocGen produces a static Markdown reference from an endpoint list. They solve different problems and can coexist.

Can APIDocGen import my OpenAPI file?

APIDocGen takes a plain endpoint list, not an OpenAPI file, so there is no OpenAPI import. You paste the routes you want documented. If you need spec-driven docs, a tool built around OpenAPI is the honest choice.

Which tool is best for a public developer portal?

For a public portal with branding and interactivity, Redocly (from an OpenAPI spec) is a common fit. APIDocGen outputs Markdown, which you can host anywhere but isn't a managed portal itself.

Is APIDocGen free?

There is a Free tier at $0 with unlimited use, and a Pro tier at $19/mo that adds schema generation and export. Pricing is listed on the APIDocGen site.

## Disclaimer

Disclaimer (decision-support, not a validation tool): APIDocGen formats an endpoint list you provide into a Markdown API reference. It does not import or validate OpenAPI specs, certify correctness, or replace spec-first tooling, Postman, or a hosted documentation portal. Feature and pricing details reflect the APIDocGen site and may change — verify before relying on them.

Paste your endpoint list and get a Markdown API reference without an OpenAPI spec — try APIDocGen.