Redoc

Redoc generates beautiful, three-panel API documentation from your OpenAPI spec — navigation on the left, content in the center, code samples on the right. It's what Swagger UI should look like, and it's what Docker, Netlify, and hundreds of API-first companies use for their public docs.

If you have a public API and want professional documentation, use Redoc instead of Swagger UI. The output looks modern, is responsive, and is searchable out of the box. Swagger UI is interactive (try-it-out buttons) but looks dated. Scalar is the newest challenger with even slicker styling. Stoplight is the commercial platform for full API lifecycle management.

The catch: Redoc is read-only — no "Try it out" functionality like Swagger UI. If your users need to test endpoints directly from the docs, you'll need Swagger UI alongside Redoc or switch to Scalar. The free open-source version is rendering-only; Redocly's commercial platform adds linting, versioning, and a visual editor. And customizing beyond themes requires diving into the React component internals.