Fern
buildwithfern.comDocs, SDKs, and CLIs for your API from one source of truth
Dev Toolsapisdk-generationdocumentationopenapideveloper-experiencecligraphql
About
Fern is a developer tooling platform that generates API documentation, SDKs in multiple languages, and CLI tools from a single OpenAPI or other API specification. It supports modern API protocols including REST, WebSockets, GraphQL, and gRPC. The platform targets companies building APIs and offers enterprise features like SSO, RBAC, self-hosting, localization, and SOC 2 compliance.
Problem
API teams struggle to keep documentation, SDKs, and CLI tools in sync as their API evolves across multiple sources.
For
API-first companies and developer teams building and maintaining APIs
How it works
Users provide an API spec (OpenAPI, GraphQL, AsyncAPI, gRPC) and Fern automatically generates synchronized docs, client SDKs, and a CLI from that single source of truth.
Business model
freemium
Status
launched
Company
Fern