Your API changelog
writes itself

An API changelog tool watches your OpenAPI or Swagger spec and automatically writes a changelog entry every time it changes, flagging breaking changes so consumers aren't surprised. ApiNotes also generates interactive docs from the same spec—complete with live endpoint testing, code examples in 10+ languages, and a shareable developer portal.

With ApiNotes, it takes three steps: 1) Choose a URL for your docs (e.g., my-api.apinotes.io), 2) Paste, upload, or link your OpenAPI 3.x or Swagger 2.0 specification, 3) Click "Generate Docs" and publish. Your changelog and interactive docs are live in under 60 seconds, and every future spec push adds a new changelog entry automatically.

Yes. The Starter plan is completely free and includes 2 projects, custom domains, an auto-generated changelog, interactive API testing, and auto-generated docs from OpenAPI specs. No credit card is required. The Developer plan at $6.99/month adds team collaboration, private docs, and analytics.

ApiNotes currently supports OpenAPI 3.0, OpenAPI 3.1, and Swagger 2.0 specifications in both YAML and JSON formats. We're soon adding automatic conversion from Postman Collections, Bruno, and Insomnia exports so teams can get a changelog and docs regardless of their API testing tool.

ApiNotes provides the core features small teams need—an auto-written changelog with breaking-change alerts, interactive docs, live API testing, custom domains, and OpenAPI validation—at a fraction of the cost. Enterprise tools like Bump.sh, Stoplight, and ReadMe start at $399+/month. ApiNotes's paid plan is $6.99/month, making it 80% cheaper with a generous free tier.

Absolutely. ApiNotes includes a built-in OpenAPI Validator that checks your spec against the official OpenAPI 3.x and Swagger 2.0 standards. It highlights errors with line numbers and suggestions. You can also compare spec versions and see exactly what changed with the Spec Diff Tool.

Yes. Every plan includes subdomain hosting (your-api.apinotes.io) and the ability to connect your own custom domain. Point a CNAME record to ApiNotes and your changelog and docs are served from your brand's domain.