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Fern

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Fern is an API developer-experience platform that generates hosted documentation sites, client SDKs, and a CLI from a single API specification such as OpenAPI, AsyncAPI, GraphQL, or gRPC.

buildwithfern.com ↗Structured profile ↗

Prepared by Scribble from public sources.

Reviewed public sources (8)

Snapshot

Continue to About ↓
What it does
  • Fern is an API developer-experience platform that generates hosted documentation sites, client SDKs, and a CLI from a single API specification such as OpenAPI, AsyncAPI, GraphQL, or gRPC.
More detail
  • It also produces AI-consumable surfaces including an MCP server, llms.txt index, Markdown page variants, and an "Ask Fern" assistant so agents and developers can read the docs.
Best for
  • API-first companies and platform teams that publish public or partner-facing APIs and want docs and SDKs to stay in sync with the spec.
More detail
  • Teams without a dedicated developer-experience function, and those who want their API consumed by AI agents.
Pricing
  • Fern is B2B SaaS with a free tier and paid tiers; the exact paid plan prices are not stated in the supplied evidence, so treat them as unknown.
More detail
  • The free Docs tier includes 10 team members, 1,000 pages, 250 AI credits/month, and 2,000 page generations/month.
  • The free SDK tier covers only Python and T
Main limitation
  • Teams without a machine-readable API spec or without Git-based, code-first documentation workflows
More detail
  • non-technical doc editors
  • and buyers needing free multi-language SDKs, since only Python and TypeScript SDKs are free.
Record
Living and monitored
Reviewed
Evidence
Public web research

About

  • Fern is an API developer-experience platform that generates hosted documentation sites, client SDKs, and a CLI from a single API specification such as OpenAPI, AsyncAPI, GraphQL, or gRPC.
  • It also produces AI-consumable surfaces including an MCP server, llms.txt index, Markdown page variants, and an "Ask Fern" assistant so agents and developers can read the docs.

What it helps with

Capabilities

A practical view of what is available and where limitations apply.

OfferingAvailableDetail
Generated documentation sites YesBeautiful, customizable hosted docs sites built from your spec, configured in fern/docs.yml.
Generated SDKs LimitedFree tier covers only Python and TypeScript up to 200 endpoints; Go, Java, C#, Ruby, PHP, Swift, and Rust require Enterprise. Kotlin is listed as in progress.
Branded CLI YesGenerated CLI distributed via Homebrew, npm, and Scoop.
API reference from spec YesBuilt from OpenAPI, AsyncAPI, GraphQL, gRPC/Protobuf, or OpenRPC definitions, with an in-page API explorer.
AI-agent surfaces YesMCP server, llms.txt index, Markdown page variants, and the Ask Fern assistant.
Documentation workflow LimitedContent is authored in MDX and versioned in Git, a code-first workflow that requires spec discipline.
SSO, SCIM, RBAC LimitedAvailable only on the Enterprise tier per the pricing page.
Self-hosting LimitedAvailable only on the Enterprise tier.
Compliance YesSOC 2 Type II with annual penetration tests, per Fern's documentation.
Free tier limits LimitedFree Docs tier allows 10 team members, 1,000 pages, 250 AI credits/month, and 2,000 page generations/month.

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Evidence

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Verification
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  • The owner has not manually confirmed every field.
Last reviewed
Primary source
buildwithfern.com
Technical profile details
Record IDe254562b-1f22-4bef-aa27-941172cddf1cCanonical URLhttps://profiles.scribble.network/listing/fern-e254562b