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Instantly offer SDKs and API Docs
APIs underpin the internet but are still painful to work with. They are often untyped, unstandardized, and out-of-sync across multiple sources of truth. Fern helps companies deliver SDKs and API documentation that they’re are proud to share with their customers. Since launching in 2023, we’ve been trusted by over 200 customers, including industry leaders like Square, Webflow, ElevenLabs, Auth0, and Intercom, to power their developer and agent experiences. We’re fewer than 40 people, based in Brooklyn, NY, and are building open source.
Fern provides docs, SDKs, and a CLI for APIs, with OpenAPI-based generation of multi-language SDKs, interactive documentation, and agent-first tooling. It positions itself as an AI-era platform for unified API docs, SDKs, and CLI from a single source of truth, with enterprise-grade security and hosting options.
Fern offers a platform to generate and maintain API docs, client SDKs in multiple languages, and a command-line interface from an API specification (OpenAPI, GraphQL, AsyncAPI, gRPC). It supports docs-as-code with versioning, AI-assisted authoring, built-in AI chat grounded in docs, an MCP server for real-time AI querying, multi-source documentation from multiple repos, and hosting options (self-host or managed cloud). It includes features like per-team access control, SSO/RBAC, multi-language localization, Postman integration, and deployment flexibility (custom domains, subpaths, self-hosting).
Who it’s for: API-driven organizations and developers needing standardized docs, SDKs, and CLI; teams requiring enterprise security, self-hosting, and multilingual/documentation tooling.
Hiring/traction mentions present (Careers), SOC 2 compliance, enterprise onboarding, pricing page details, multiple pricing plans including enterprise, self-hosting option
AmazonHey- I'm a co-founder and CEO at Fern. We help companies offer SDKs and API Docs they're proud to share with their customers. In my previous role at AWS, I saw how code generation for APIs saved engineering time and offered a best-in-class developer experience. I'm a people person who is happiest at work when collaborating in person or when hearing customer feedback first-hand.
Deep is a YAML engineer at Fern. Before Fern, he worked as a software engineer at Palantir focusing on data integration at the Department of Defense and US Army.
Auto-generate your client libraries, API reference, and server code
Fern productizes schema-first API design by generating SDKs in multiple languages, API docs, a Postman collection, and server-side validation from an API schema or OpenAPI spec. It also registers all API versions in a registry for consistent consumption. The launch highlights the tool’s artifacts for developers and teams building or consuming APIs.
From the original launch (Feb 2023) — may be outdated.
How Fern’s homepage introduced itself over the years — each line is the page title the web actually saw, linked to that moment’s archived capture.
AI-native insurance brokerage.
AI-powered product assistance for modern software teams
