Does Fern only do API docs?

No, Fern provides docs, SDKs, and a CLI from your API spec, all in sync from a single source of truth.

How customizable is the look and feel of my docs site?

Highly customizable via custom CSS, JavaScript, and React components. You can match your brand exactly, including custom fonts, colors, and layouts.

Are security reviews available?

Yes, Fern is SOC 2 Type II compliant, undergoes annual pentests, and can accommodate custom security questionnaires and MSAs.

What plan should I choose if I need SSO and RBAC?

SSO and role-based access control are included in the Enterprise plan. Contact our sales team for custom pricing.

Can I self-host Fern?

Yes, self-hosting is available on the Enterprise plan to meet stricter security, networking, and compliance requirements.

Fern

Updated Jul 26, 2026

Generate beautiful docs, idiomatic SDKs, and an agent-first CLI from your API spec. One source of truth, everything in sync.

Categories:

Developer Tools|

Code Assistant|

#api documentation#sdk generation#openapi#ai documentation#developer experience

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Editor's Verdict

Rating: 4.6/5.0•Reviewed by RAGWiki

At $0/mo, Fern stands out as a powerful solution in the developer tools,code assistant landscape. It is especially well-suited for professionals like Software Engineer and API Developer. However, potential buyers should note that it might not be perfect if you are strictly trying to avoid requires well-defined openapi spec. Overall, it offers a robust toolset that significantly accelerates workflows.

Key Takeaways

Agent-friendly docs
Generated SDKs
CLI
AI search and chat

In-Depth Review: What is Fern?

Fern provides a unified platform to create stunning documentation, type-safe SDKs in major languages, and an interactive CLI from your API spec. Built for the AI era, it features AI-assisted authoring, AI chat in docs, MCP server support, and llms.txt for LLMs. Over 8,000 customers use Fern to reduce time-to-first-API-call by 99% and serve 20M+ docs pages yearly.

Core Features

Agent-friendly docs

Documentation optimized for both human developers and AI agents, with search, MCP server, llms.txt, and AI chat.

Generated SDKs

Type-safe client libraries in every major language automatically generated from your OpenAPI spec.

CLI

Interact with your API from the terminal, generate docs and SDKs, and manage deployments.

AI search and chat

Built-in AI chat grounded in your docs, answering developer questions without hallucinations.

Docs as code

Manage documentation in Git, review with pull requests, and use any coding agent to write updates.

llms.txt and MCP server

Auto-generated llms.txt and MCP server for seamless integration with LLMs and AI tools.

AI-assisted authoring

Tag @Fern Writer to draft content, open PRs, and keep docs in sync with your code.

Multi-source docs

Aggregate content from multiple repos into one site with product and version switching.

Enterprise security

SOC 2 Type II, SSO, RBAC, self-hosting, and dedicated support for enterprise compliance.

Native Postman support

Generate and publish Postman collections from the same source of truth as your docs and SDKs.

Pricing

Hobby

$0/mo

2 team members
250 AI credits
Custom domain
Password-protected docs
Guides, API refs, and changelogs
API explorer
Web editor

Team

$150/mo

Everything in Hobby
5 team members
1,000 AI credits
Custom subpath
Version and product switching
PDF exports

Enterprise

Custom

Everything in Team
Visitor authentication (JWT, SSO)
Role-based access control (RBAC)
Translated content
Self-hosting
Enterprise SSO
Dedicated Slack & Teams channel

Pros and Cons

Pros

Reduced time to first API callFern reduces time to first API call by 99% through clear documentation and generated SDKs.
Consistent multi-language SDKsGenerate SDKs in every major language from a single OpenAPI spec, ensuring consistency and reducing drift.
AI-powered developer experienceIntegrated AI search, chat, and writing agent improve documentation engagement and developer productivity.
Open source and extensibleFern is open source, allowing custom generators and integration into existing workflows.
Enterprise-grade security and complianceSOC 2 Type II, SSO, RBAC, self-hosting, and dedicated support meet enterprise requirements.

Cons

Requires well-defined OpenAPI specFern relies on a complete and accurate OpenAPI specification; incomplete specs require additional effort.
Learning curve for docs-as-codeTeams new to Git-based documentation workflows may face a learning curve.
Limited free tierThe Hobby plan restricts team members (2) and AI credits (250), which may not suit larger teams.
Customization requires CSS/JS expertiseAdvanced visual customization may require knowledge of CSS, JavaScript, or React.
Advanced features locked in higher tiersFeatures like SSO, RBAC, and self-hosting are only available in the Enterprise plan.

Use Cases & Recommended Professions

Software Engineer→ View Toolkit

Needs quick API integration with clear documentation, SDKs, and sandbox for testing.

API Developer→ View Toolkit

Designs APIs and requires auto-generated docs and SDKs for multiple languages to streamline delivery.

Technical Writer→ View Toolkit

Creates and maintains developer documentation; benefits from version control and AI-assisted authoring.

DevOps Engineer→ View Toolkit

Uses CLI for API interactions and automated deployments; needs versioned, secure docs.

Product Manager (Developer Tools)→ View Toolkit

Oversees developer experience and reduces friction by providing consistent SDKs and docs.

Solutions Architect→ View Toolkit

Evaluates tools for API documentation and SDK generation; requires enterprise compliance and scalability.

Frequently Asked Questions

developer tools chatbots code assistant

ℹ️ Curation Disclosure: The overview and features of Fern were synthesized using AI and fact-checked by our curation team to ensure accuracy.