Redocly

Redocly is an API documentation and governance platform that helps organizations turn APIs into competitive advantages through high-quality developer portals and automated quality controls. Originating from Rebilly, the company built Redoc, an open source OpenAPI documentation renderer that has grown into the most popular API documentation tool on GitHub with 25,771 stars and over one million weekly npm downloads, serving more than 212,000 companies and linting over one billion API requests over nine years of development. The commercial platform, Redocly Realm, provides a complete API documentation lifecycle solution: reference documentation generation from OpenAPI and AsyncAPI specifications, interactive API explorer with live try-it functionality, developer portal customization with theming and branding, and content workflows integrating Markdown and MDX for guides and tutorials. The CLI toolchain includes API linters that enforce organizational style guides, bundle and dereference multi-file OpenAPI definitions, and validate against the OpenAPI specification. Source control integration with GitHub and GitLab enables collaborative editing with pull request workflows, preview deployments, and version management. Announcement banners display critical updates at the top of documentation pages. Single sign-on, role-based access control, and analytics on API usage and documentation engagement are available in enterprise plans. Customers include GitHub, Intercom, Brex, Adobe, GitLab, Sinch, ClickUp, Checkr, and Viking. A 30-day free trial is available with no credit card required.