Fern

A platform that generates documentation websites, SDKs, and CLIs from a single API specification, solving the problem of maintaining consistent developer tools across multiple languages and protocols. It sells to engineering teams and developers at companies of all sizes, from startups to enterprises, who need to provide high-quality API documentation and client libraries. The platform differentiates by being built for the AI era, with agent-friendly features like llms.txt, MCP server support, and AI chat, and is delivered as a SaaS with self-hosted options.

Key features

• Docs as code with Git versioning
• AI chat grounded in docs
• Auto-generated llms.txt for agents
• MCP server for AI tools
• AI-assisted authoring with PRs
• Generated SDKs in major languages
• CLI generation from API spec
• Autorelease for SDK updates
• Browser-based editor for docs
• Support for REST, GraphQL, WebSockets