Question: Is there an API documentation tool that supports multiple formats like OpenAPI, Postman, and GraphQL?

If you're looking for an API documentation tool that supports multiple formats like OpenAPI, Postman, and GraphQL, Theneo could be a good fit. Theneo uses AI to generate high-quality documentation with a minimal amount of work, supporting multiple platforms. It also has features like importing API collections, automatically generating descriptions and summaries, and publishing customizable documents. On top of that, it has automated updates and integrates with tools like GitHub, Gitlab, and npm packages to keep your documentation up to date.

Another contender is ReAPI, which accelerates API design, testing and documentation with its suite of interlinked tools. It includes a visual API designer based on OpenAPI, a no-code test case designer and a serverless cloud runner. ReAPI's documentation is automated and looks good, and it's got collaboration and versioning tools so teams can work together without friction.

If you're looking for a more interactive documentation platform, you might want to check out Alphadoc. It lets developers create, manage and publish high-quality documentation for APIs and SDKs with a visual editor and interactive diagrams. Alphadoc also supports custom domains and styling, unlimited endpoints per API, and flexible collaboration and CI/CD integrations, so it's a good fit for teams that want to improve their developer experience.