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Fern

Freemium
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Docs, SDKs, and CLIs for your API

Site Internet :https://buildwithfern.com/
Ajouté :13 juil. 2026
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Réseaux sociaux et e-mail :
API documentationSDK generationagent-first CLIOpenAPIdocs as codeAI agents
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Informations sur l’outil

Qu'est-ce que Fern ?

Fern is a platform that generates interactive API documentation, multi-language SDKs, and agent-first CLIs from a single source of truth. Starting from OpenAPI and supporting modern protocols, it helps improve developer and AI agent experiences.

Fonctionnalités principales

  • API Documentation

    Beautiful, customizable documentation websites with search, AI features, and agent support.

  • SDK Generation

    Client libraries designed by language experts, generated from API specifications.

  • CLI

    Agent-first CLI for interacting with the API from the terminal.

  • Docs as code

    Manage documentation like a codebase with Git versioning, pull requests, and coding agents for writing and updates.

  • AI chat in docs

    Built-in AI chat that answers user questions grounded in the docs without hallucinations or generic responses.

  • llms.txt

    Docs ship as clean Markdown with auto-generated llms.txt so LLMs and agents can read them.

  • MCP server

    Expose docs via MCP server for AI agents.

  • AI-assisted authoring

    Integrate AI into writing, maintaining, and consuming documentation.

  • Multi-protocol support

    Supports modern API protocols including REST, WebSockets, GraphQL, OpenAPI, AsyncAPI, and gRPC.

  • Native Postman support

    Native support for Postman.

  • Enterprise-ready features

    Security and access control, multi-source docs, self-hosting, localization, compliance, and support with SLAs.

  • SOC 2 compliance

    SOC 2 compliant and secure via trust center.

Cas d'utilisation

  • #1

    Generate interactive API docs

    Build beautiful, customizable documentation websites that developers and AI agents can use effectively.

  • #2

    Generate multi-language SDKs

    Create client libraries from OpenAPI and other specs to accelerate API adoption.

  • #3

    Provide agent-first CLI and interfaces

    Offer terminal-based and MCP-enabled access to APIs designed for the AI era.

  • #4

    Migrate to enterprise docs platform

    Move existing docs and SDKs to an enterprise-ready platform with security, self-hosting, and compliance.

Idéal pour :API developersDeveloper experience teamsAPI product companiesEnterprises needing secure, self-hosted, or compliant documentation

Plans tarifaires

Start for free option available along with a pricing page and book a demo.

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Foire aux questions

What is Fern?
Fern is a platform that generates interactive API documentation, multi-language SDKs, and agent-first CLIs from OpenAPI and related specifications to improve developer and AI agent experiences.
What does Fern generate from a single source of truth?
Fern produces docs, SDKs, and CLIs for APIs, starting from OpenAPI and supporting modern protocols.
Does Fern support AI features in documentation?
Yes. Fern includes built-in AI chat grounded in the docs, auto-generated llms.txt for LLMs and agents, an MCP server, and AI-assisted authoring.
Which API protocols does Fern support?
Fern supports modern API protocols including REST, WebSockets, GraphQL, OpenAPI, AsyncAPI, and gRPC, plus native Postman support.
Is Fern suitable for enterprise use?
Yes. Fern offers enterprise-ready features such as security and access control, multi-source docs, self-hosting, localization, compliance, support with SLAs, and SOC 2 compliance.
How does Fern handle documentation management?
Fern supports docs as code, allowing you to manage documentation like a codebase with Git versioning, pull requests, and coding agents for writing and updates.
Is there a free way to start with Fern?
Yes. Fern offers a start for free option, along with a pricing page and the ability to book a demo.

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Informations sur l’outil

Modèle tarifaireFreemium
CatégorieOutils pour développeurs
Tags
API documentationSDK generationagent-first CLIOpenAPIdocs as codeAI agents
LangueAnglais
Dernière mise à jour16 juil. 2026
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