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Fern: Docs, SDKs, and CLIs for your API

Start with OpenAPI. Generate SDKs in multiple languages, interactive API documentation, and an agent-first CLI.

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Fern: Docs, SDKs, and CLIs for your API Upgrade your developer and agent experience Docs, SDKs, and a CLI for your API. Built for the AI era. Agent-friendly docsGenerated SDKs Docs your developers and agents actually use, with search, MCP server, llms.txt, and AI search baked in. 20M+ Docs pages served per year 99% Reduction in time to first API call 14x AI search engagement Agents at workDevelopers at work Docs readDocs read by agents74,25701234567890123456789,012345678901234567890123456789 Ask Fern answersAsk Fern answers890,491012345678901234567890123456789,012345678901234567890123456789 Enhanced examplesAI-enhanced code examples10,022,41201234567890123456789,012345678901234567890123456789,012345678901234567890123456789 Docs viewedDocs viewed by developers133,213,868012345678901234567890123456789,012345678901234567890123456789,012345678901234567890123456789 SDKs generatedSDKs generated13,39201234567890123456789,012345678901234567890123456789 Docs publishedDocs published346,745012345678901234567890123456789,012345678901234567890123456789 API callsAPI calls made2,076,8680123456789,012345678901234567890123456789,012345678901234567890123456789 Docs readDocs read by agents74,25701234567890123456789,012345678901234567890123456789 Ask Fern answersAsk Fern answers890,491012345678901234567890123456789,012345678901234567890123456789 Enhanced examplesAI-enhanced code examples10,022,41201234567890123456789,012345678901234567890123456789,012345678901234567890123456789 Docs viewedDocs viewed by developers133,213,868012345678901234567890123456789,012345678901234567890123456789,012345678901234567890123456789 SDKs generatedSDKs generated13,39201234567890123456789,012345678901234567890123456789 Docs publishedDocs published346,745012345678901234567890123456789,012345678901234567890123456789 API callsAPI calls made2,076,8680123456789,012345678901234567890123456789,012345678901234567890123456789 Docs, SDKs, and CLIDocs, SDKs, and CLI from one source of truthfrom one source of truth Support modern API protocols: REST, WebSockets, and GraphQL.