API Tools
API development, testing, documentation, and management platforms.
API tools help developers design, test, document, and monitor APIs throughout their lifecycle. They are used by backend engineers building REST or GraphQL APIs and by frontend teams consuming them who need reliable documentation and testing environments. Evaluate whether you need a full API platform with design-first capabilities or a focused testing tool, and check for team collaboration features if multiple developers work on the same APIs.
Postman
The most popular API development platform — testing, documentation, and mocking
Insomnia
Open-source REST and GraphQL API client from Kong
Bruno
Git-friendly open-source API client — stores collections as plain text files
Hoppscotch
Lightweight open-source API testing tool in the browser — Postman alternative
Stoplight
API design-first platform with OpenAPI editor, style guides, and documentation