Fern is a developer tools company founded in 2022, based in Williamsburg, Brooklyn. It operates as a developer tools platform that transforms API definitions into production-ready SDKs, interactive documentation, and CLI tools. The company maintains independence as a startup while being backed by resources from Postman.
The platform offers several core products. Its SDK Generation tool creates client libraries in multiple programming languages - including TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, and Rust - from a single OpenAPI specification. The Interactive Documentation product generates documentation featuring AI-powered chat capabilities, llms.txt generation for LLM consumption, and an AI-assisted authoring tool called Fern Writer. The company also provides CLI Tools generation from API definitions and supports MCP server configurations.
Fern's technical domains span API tooling, SDK generation, documentation generation, CLI tools, and AI-powered documentation. The team includes builders with experience at Google, Palantir, Amazon, and Uber, and serves the software development, API tooling, and AI company sectors.
