API documentation tools guide: how to choose the right one

Step 1 — define your input style

The biggest fork is spec-first vs list-first.

Spec-first (OpenAPI/Swagger, Redocly): you write a formal spec and generate everything from it. Best when the spec is your source of truth.
List-first (APIDocGen): you paste the endpoints you have and get a reference. Best when you don't want to maintain a spec.

Step 2 — know your audience

Internal team → a Markdown reference in the repo is often enough.
External developers → you may want a hosted, branded portal with versioning and API keys.

Step 3 — decide on output

If the deliverable is Markdown you control, a list-first generator fits. If you need hosting, auth, and interactivity, budget for a portal tool (ReadMe, Redocly) and the seat or usage cost that comes with it.

Step 4 — weigh setup cost and budget

Spec-first tooling pays off at scale but costs more to set up. APIDocGen's list-first path is the lowest setup: paste endpoints, pick a language, get Markdown. There's a Free tier at $0, with Pro at $19/mo adding schema generation and export.

An honest recommendation

Pick the lightest tool that meets the requirement. If you only need a clean reference from endpoints, APIDocGen's list-first Markdown output is the lowest-friction path. If you need a portal or spec validation, choose a spec-first or hosted tool — APIDocGen doesn't replace those.

FAQ

How do I choose an API documentation tool?

Define three things: your input style (spec-first or list-first), your audience (internal or public), and your output (Markdown or a hosted portal). The lightest tool that meets all three is usually the right one.

Should I go spec-first or list-first?

Go list-first if you just have endpoints and want docs fast without maintaining a spec — that's APIDocGen's path. Go spec-first if you want one spec as the source of truth for docs, mocks, and SDKs.

Do I need a hosted portal?

Only if external developers need it at scale. A hosted portal (ReadMe, Redocly) adds branding, versioning, and API keys — and a cost. For internal use, Markdown in the repo is often enough.

Is a free tool enough?

For internal Markdown docs, often yes. APIDocGen has a Free tier at $0 for unlimited use; you'd move to Pro ($19/mo) when you want schema generation and export.

What does APIDocGen not do?

It doesn't import or validate OpenAPI specs, host a portal, or manage API keys. It documents the endpoint list you paste as Markdown with examples and auth notes.

## 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, host a portal, or manage API keys. Feature and pricing notes reflect the APIDocGen site and may change — verify before relying on them.

Pick the lightest tool for the job — paste your endpoints and get Markdown docs — try APIDocGen.