Popular
Swagger
Open source tools for designing and documenting OpenAPI APIs
API DesignOpenAPI docs and tooling
Alternatives to OpenAPI
12 tools like OpenAPI, chosen by what they do. About OpenAPI
Freemium
Stoplight
Visual platform for designing, documenting and mocking OpenAPI
API DesignAPI design and docs platform
Open source
OpenAPI Generator
Generates API clients, server stubs and docs from OpenAPI
Design and SDKsGenerate clients from OpenAPI
Open source
Zod
TypeScript-first schema validation with static type inference
API DesignTypeScript schema validation
Freemium
Apidog
All-in-one API platform for design, testing, mocking and docs
API ClientsAll in one API platform
Open source
AsyncAPI
Open source specification and tools for event-driven APIs
Design and SDKsSpec for event driven APIs
Open source
Insomnia
Open source desktop client for testing HTTP, GraphQL and gRPC APIs
API ClientsOpen source API client
Open source
Scalar
Hosted API docs, typed SDKs and MCP servers from an OpenAPI file
Design and SDKsModern OpenAPI docs and client
Open source
TypeSpec
Code-first language to define APIs and emit OpenAPI or JSON Schema
Design and SDKsDesign APIs with code
Open source
Freemium
Fern
Generate SDKs, API docs and a CLI from an OpenAPI spec
Design and SDKsSDKs and docs from your API
Freemium
Apiary
Hosted platform to design, prototype, document and test APIs
Design and SDKsAPI design and docs platform