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API Tools

Design, document and explore APIs.

Popular

Swagger / OpenAPI

Tooling ecosystem built around the OpenAPI Specification for designing, documenting, and generating clients for REST APIs.

API Tools
Freemium
Open Source
api-docsopenapispec
Official site Docs

GraphQL

Query language for APIs that lets clients request exactly the data they need from a single endpoint.

API Tools
Free
Open Source
query-languageapischema
Official site Docs

Hoppscotch

Open-source, browser-based API request builder supporting REST, GraphQL, and WebSocket testing.

API Tools
Freemium
Open Source
api-testingrestgraphql
Official site Docs

RapidAPI

Marketplace and gateway for discovering, testing, and connecting to thousands of third-party public APIs.

API Tools
Freemium
api-marketplacediscoverygateway
Official site