Mintlify vs Fern

Start with the free plan your team can actually use

Our recommendation is to pilot Fern when its API-reference workflow and small included AI budget meet your needs. Evaluate Mintlify when its documentation workflow fits your team and you want a published Pro upgrade price. Choose an open-source project when owning the implementation and deployment is a requirement. These are editorial starting points, not measured product rankings.

The current pricing pages list five editors for Mintlify Starter and ten team members for Fern Free. Both include a custom domain. Fern publishes limits of one site, 1,000 pages and 2,000 page generations per month. Determine how your publishing frequency consumes that allowance before treating a large site as permanently free.

For a five-person team with one small public site, the published contributor allowances alone do not force a paid plan. Write down the features that do: access rules, customization, preview requirements or usage. The pricing table separates an actual paid upgrade from an Enterprise quote that still needs negotiation.

Paid pricing: a public rate versus a custom quote

Mintlify Pro is $540/month with monthly billing or $450/month equivalent with annual billing. The annual subscription is $5,400 before usage charges; twelve monthly payments total $6,480. Use our Mintlify pricing guide and credit calculator to budget the subscription and usage separately.

Fern's Docs page currently lists Free and Enterprise. It does not publish a fixed Enterprise price. Its SDK tab describes a different product, so an SDK price cannot stand in for a documentation subscription. Confirm Enterprise scope and terms directly with Fern rather than assigning it an invented monthly rate.

Make your quote request specific: number of sites and contributors, required custom components, authentication, usage, support and self-hosting. Compare the resulting contract with your actual needs. A zero subscription price is useful only while the free plan supports the work your team needs to do.

API documentation: test your specification and request flow

Fern's API reference documentation describes generated endpoint pages, schemas, examples and an interactive API Explorer. It covers OpenAPI as well as formats such as AsyncAPI and gRPC. Mintlify's API playground documents interactive requests and configuration for browser or proxied traffic.

Run a representative pilot instead of assuming that supported formats produce identical results. Include an authenticated request, nested body, optional parameter and error response. Check what a reader sees, whether the request reaches a test endpoint correctly, and how a specification change updates the reference.

If your documentation covers streaming, WebSockets or another protocol, make that part of the pilot. A successful REST import cannot answer every protocol question. We reviewed the documentation; we have not run a side-by-side API benchmark or an SDK-generation comparison.

Editing: preserve the review process

Fern Editor allows contributors to edit visually without GitHub access. Its documentation says edits create pull requests or GitLab merge requests, retaining a Git-backed review process. It currently documents desktop Chromium support; mobile editing is still listed as coming soon.

For either platform, test one correction by a non-engineer and one repository change by an engineer. Inspect the generated files, review the preview, merge the change and verify the published result. Then test a conflicting edit. That exposes workflow fit more clearly than a feature checklist.

Keep a copy of your content and assets during the pilot. MDX content alone does not guarantee that custom components, navigation and access settings transfer unchanged.

AI allowances: compare actions before credit counts

Fern's AI guide lists 250 monthly credits for the standard Free plan. Ask Fern uses two credits per message, generated examples use one credit, and a Slack documentation-update session uses 50. Postman customer benefits are a separate offer and are not assumed here.

With no other consumption, 250 credits divided by two gives at most 125 messages. That is an allowance calculation, not an answer-quality claim. Mintlify uses its own credit model; comparing the raw credit totals would misrepresent the workload.

Ask each system the same factual question, ambiguous troubleshooting question and question the docs cannot answer. Assess the citations and incorrect answers. Verify what happens when the allowance runs out before exposing a feature to readers. This guide does not establish equivalent AI behavior or unlimited use.

Self-hosting: Enterprise containers and static previews

Fern's self-hosting guide describes an Enterprise offering delivered as a Docker image with vendor-provided access credentials. Its feature matrix excludes Ask Fern, Fern Agent and Fern Editor from self-hosted deployments. A managed-plan feature should therefore not be assumed to exist in the container.

Fern also documents a beta static export for self-hosted previews, including object stores such as R2. Those previews omit search, API Explorer and authentication. The documentation concerns preview environments; it does not establish free production hosting rights or a complete replacement for the running application.

Mintlify likewise lists self-hosting under Enterprise. Discuss the supported environment, contractual terms and actual feature availability with either vendor. These sources do not justify cataloging either managed product as free open-source software you can run on Cloudflare.

A Cloudflare option with free source code

If your priority is code ownership, inspect Heyo Docs. The reviewed project has MIT-licensed source, an original README, a genuine upstream image and a Cloudflare configuration assessment. Its pinned README documents MDX, search, OpenAPI reference pages and framework deployment choices. This is a source review, not proof of a fresh installation or a completed migration.

Cloudflare makes requests served directly as static assets free and unlimited. Requests that execute Worker code follow Workers billing. Rendering mode, search services, AI, the domain and maintenance still affect the total cost.

Use our Mintlify alternatives guide to compare Heyo Docs, Fumadocs, Starlight, Docusaurus and VitePress. The self-hosting guide helps inspect a deployment path. Before changing domains, use the migration inventory to preserve routes, assets and redirects and test representative pages.

Also comparing managed platforms? Read Mintlify vs ReadMe and Mintlify vs GitBook for their distinct pricing and editing workflows.