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Fern

Read 11 Fern reviews and testimonials from customers, explore 5 case studies and customer success stories, and watch customer videos to see why companies chose Fern as their API Documentation Software

Fern is an open-source platform for generating software development kits (SDKs) and application programming interface (API) documentation. Developer-focused companies like Square, Webflow, Intercom, and more use Fern to streamline their development process, typically starting by uploading an API specification (OpenAPI, AsyncAPI, OpenRPC, and more.

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Customer Rating Review Score based on 399 reference ratings
4.8/5.0 (399)

11Testimonials

  • "The Fern Definition is absolutely fantastic. Compared to OpenAPI, it's more ergonomic and comes with powerful capabilities - you can organize endpoints by resource, import types across files, and represent …

  • "Fern is a mission-critical part of Candid's API. Keeping our docs, SDKs, and server implementation in sync was a nightmare. Fern enabled us to adopt API-first development — our engineers …

  • "The explosion of AI-driven developer tools has created an urgent need for faster, frictionless integration. By eliminating friction from the developer experience and managing the gritty engineering work that is …

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5 Case Studies

  • The first autogenerated SDK with gRPC and REST

  • How Candid sped up API development by 50% by going schema first

  • From handwritten to generated Cohere's SDK journey

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Additional Fern Information & Resources

Read Fern Reviews, Testimonials & Customer References from 11 real Fern customers.

Browse Fern Case Studies, Customer Success Stories, & Customer References from 5 businesses that use Fern.