Fern
Fern: A strong API-first documentation platform with generous free limits and enterprise controls. Ranked #42 of 136 in Knowledge Base Software by our editors (5.3/10); pricing: Free plan; best for API-first teams building documentation portals.
At a glance
- Editor score5.3 / 10
- PricingFree plan
- Best forAPI-first teams building documentation portals
- Free planYes
- Publishing audienceBoth
- Facts checked20 Sep 2026
Where it wins
- Generates references from OpenAPI, AsyncAPI, gRPC, and GraphQL
- Free plan includes 1,000 pages, custom domains, and 250 AI credits monthly
- Supports versioned sites, CI/CD publishing, analytics, and self-hosting
Where it doesn't
- Enterprise pricing is tailored rather than published as a fixed amount
- The free plan limits teams to 10 members and 1,000 pages
- Its strongest capabilities are centered on developer documentation
Our verdict on Fern
Fern is a documentation platform for developers and teams publishing API references, guides, changelogs, and other technical content. It combines OpenAPI, AsyncAPI, gRPC, GraphQL, and other API specifications with Markdown or MDX authoring to generate documentation websites. A browser-based editor, interactive API explorer, versioned sites, search, custom domains, and access controls make it suitable for public documentation as well as internal or restricted content. Teams focused on API and developer portals should find its scope closely aligned with their needs.
Pricing is straightforward at the entry level. The Free plan costs $0 USD per month and includes 10 team members, 1,000 pages, 250 AI credits per month, 2,000 page generations per month, and a custom domain and subpath. Enterprise uses tailored pricing terms and adds SSO, SCIM, advanced RBAC, multiple repositories and documentation instances, custom CSS, JavaScript, and React components, advanced analytics and data exports, and dedicated infrastructure. Self-hosting is available with Enterprise, giving organizations an option beyond Fern-hosted deployment.
Fern’s standout capability is its API documentation workflow, spanning specification-based reference generation, an interactive explorer, preview links, and CI/CD publishing. Search combines keyword and AI-assisted features, while changelog pages support search, tags, and RSS. GitHub, PostHog, Segment, Mixpanel, Google Analytics 4, Google Tag Manager, FullStory, and Intercom extend its ecosystem fit. Choose Fern when API references and developer-facing documentation are central; teams seeking a broader, general-purpose knowledge base may prefer a product whose primary focus is not API documentation.
Your product? Our editors can test Fern in depth and publish a review, labelled as paid · from $149/mo →
Fern pricing
Fern fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| Publishing audience | Both |
| Article limit | Not verified |
| Custom domain | Yes |
| SSO support | Yes |
| Version history | Yes |
| Content analytics | Yes |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Compliance & security | SOC 2 |
| Support | Email, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 5 integrations: PostHog, Segment, Intercom, Google Tag Manager, Mixpanel |
| Pricing | Free plan (source) |
| Website | buildwithfern.com |
| Facts checked | 20 Sep 2026 |
Fern integrations
Fern lists 5 integrations on its own site.
- PostHog
- Segment
- Intercom
- Google Tag Manager
- Mixpanel
Alternatives to Fern
- ConfluenceA mature knowledge workspace with structured content, permissions, search, and Atlassian integrations.9.4
- BlueSpiceA broad, open-source knowledge base with workflows, permissions, analytics, and self-hosting.9.2
- GuruA governed internal knowledge hub with cited AI answers and verification workflows.9.0
Also Ranked In
Fern is ranked in 10 of our directories; the 6 strongest besides Knowledge Base Software.
Used Fern? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Fern for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Fern is listed in our Knowledge Base Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/fern/"><img src="https://www.itechguides.com/best/badge/fern.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update