Freemium
Fern
Generate SDKs, API docs and a CLI from an OpenAPI spec
Design and SDKsSDKs and docs from your API
Alternatives to OpenAPI Generator
12 tools like OpenAPI Generator, chosen by what they do. About OpenAPI Generator
Open source
Scalar
Hosted API docs, typed SDKs and MCP servers from an OpenAPI file
Design and SDKsModern OpenAPI docs and client
Curated
Bump.sh
Hosted API docs and MCP servers, built from your OpenAPI spec
Design and SDKsAPI docs with changelogs
Freemium
Apiary
Hosted platform to design, prototype, document and test APIs
Design and SDKsAPI design and docs platform
Open source
TypeSpec
Code-first language to define APIs and emit OpenAPI or JSON Schema
Design and SDKsDesign APIs with code
Open source
AsyncAPI
Open source specification and tools for event-driven APIs
Design and SDKsSpec for event driven APIs
Popular
JSON Schema
Standard vocabulary for describing and validating JSON data
Design and SDKsStandard for JSON validation
Open source
Joi
Schema description and validation library for JavaScript objects
Design and SDKsSchema validation for JS
Open source
OpenAPI
Open standard for describing HTTP APIs in a machine-readable way
API DesignThe OpenAPI standard
Popular
Swagger
Open source tools for designing and documenting OpenAPI APIs
API DesignOpenAPI docs and tooling
Freemium
Stoplight
Visual platform for designing, documenting and mocking OpenAPI
API DesignAPI design and docs platform
Freemium
Apidog
All-in-one API platform for design, testing, mocking and docs
API ClientsAll in one API platform