Fern
by Fern · Docs, SDKs and a CLI generated from your API spec
BenchRank score
Screenshots of Fern
Homepage
Overview
Fern generates a documentation site, client SDKs and a CLI from an API specification, with support for OpenAPI, AsyncAPI, gRPC and GraphQL. Docs are managed as code in Git, published via the fern CLI, and served as Markdown with an auto-generated llms.txt, AI chat and an MCP server. Paid plans add version and product switching, visitor authentication, translation and self-hosting.
- Best for
- Teams with an OpenAPI-style spec who want hosted docs, generated SDKs and a CLI from one source
- Pricing
- Free Hobby plan, then Team at $150/month, with Enterprise priced on request; the page advertises a 25% saving for yearly billing but does not show the yearly figure.
- Runs on
- WebmacOSSelf-hostedCLI
Strengths and trade-offs
Strengths
- Docs, SDKs and CLI generated from one API spec
- Docs-as-code: versioned in Git, reviewed in pull requests
- Ships llms.txt, AI search and an MCP server for docs
- Supports OpenAPI, AsyncAPI, gRPC and GraphQL specs
Trade-offs
- Free Hobby plan is capped at 2 members and one docs site
- Next paid step is $150/month; no tier in between
- SSO, RBAC, self-hosting and localisation need Enterprise
- AI use is metered: 250 credits on Hobby, 1,000 on Team
How Fern markets itself
A structured read of the promise, proof and page design on Fern’s captured homepage.
Homepage capture
“Upgrade your developer and agent experience”
- Angle: AI-native
- Hero: Product screenshot
Pricing
Published plans and prices from Fern’s own pricing page.
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
MCP support
Whether an agent can drive the product through the Model Context Protocol, and how much setup that takes.
API quality
Public API surface: machine-readable spec, official SDKs, documented auth, errors, rate limits and versioning.
Documentation
Publicly reachable docs — coverage, freshness, code samples and machine readability.
Agent friendliness
How readable the site is to an automated client: llms.txt, structured data, server-rendered content, crawler access.
Pricing transparency
Whether real prices are published, self-serve signup exists, and usage costs are knowable without a sales call.
Changelog
A public, dated record of what shipped and when — the clearest signal that a product is still alive.
Marketing site structure
Whether the site answers a buyer's questions: clear positioning, the pages that matter, and accessibility.
Page speed
How fast the site loads for real visitors: Chrome UX Report 75th-percentile LCP, INP and CLS, with a Lighthouse mobile run standing in where a site has too little traffic for field data.
Operational trust
Status page and incident history, security disclosure, compliance and data-processing documentation.
Measured, but not part of the score
Useful to know, but not a mark for or against the product — so these do not affect the ranking.
Openness
Source availability, self-hosting, data export and open standards. Scored and shown, but not part of the composite — paid SaaS is not worse for being paid SaaS.
Maintenance
Release cadence and repository activity. Scored and shown, but not part of the composite — it is only measurable for open repositories.
This doesn’t look right — report a problem with Fern’s score
Where this comes from
The Fern pages BenchRank reads when it scores the product — its documentation, release notes, status and security pages, and its repository where there is one.
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Is this your product?
Claim Fern to manage its profile. Claiming lets you suggest edits to the descriptive fields — it never changes scores or rankings.