Fern

Docs and SDKs generated from your API.

Filed under: Coding

About Fern

Fern generates documentation websites and client SDKs from your API definition, keeping docs and libraries in sync with every release. Its docs sites are known for Stripe-like polish. In AI coding tools for API teams, Fern covers both docs and SDKs. Startups shipping APIs built with Cursor use Fern to look enterprise-grade.

Key features

Docs generated from API specs
Multi-language SDK generation
Versioned documentation
Custom branding
MDX customization
Free tier available

Fern screenshots

Fern: pros & cons

Pros

Docs plus SDKs in one
Beautiful default design
Keeps everything in sync
Free tier available

Cons

API-focused niche
Setup takes effort
Paid for scale

Fern FAQs

Is Fern free?

Fern offers a free tier; paid plans add team features and scale.

What does Fern generate?

Documentation sites and SDKs in multiple languages from your API definition.

How is Fern different from Mintlify?

Fern also generates client SDKs, while Mintlify focuses on docs sites.