Generates polished API documentation and client SDKs in multiple languages directly from an OpenAPI spec.
The short version: Fern removes one of the most tedious, easy-to-neglect jobs in API development — keeping docs and SDKs in every language in sync with the actual API — by generating both from a single source of truth. Being genuinely open source (Apache-2.0, 3.7k stars) with a self-hosting option distinguishes it from competitors like ReadMe or Mintlify that are closed-source SaaS-only, which matters for companies with data-residency or vendor-lock-in concerns. Multi-protocol support (REST, WebSockets, GraphQL, AsyncAPI, gRPC) beyond just OpenAPI/REST is also broader than most docs-generatio…
API-first companies | Developer platform teams
Worldwide