Free tools

Small, focused utilities for people who write and maintain documentation. Free, no signup, and where a tool can do its work in your browser, it does.

• OpenAPI validator

  Finds missing responses, undeclared path parameters, duplicate operationIds and unresolved $refs. Runs entirely in your browser; your spec is never uploaded.

• AI crawler URL inspector

  Shows the text an AI crawler actually extracts from a URL, whether your content needs JavaScript to appear, and which AI crawlers your robots.txt allows, evaluated per agent, because GPTBot and ChatGPT-User are different decisions.