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Head-to-head · API Documentation Tools

Fern vs Theneo

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score Fern #1 in API Documentation Tools 9.4/10 Free plan Free plan✓ 1 of 5 features Visit Fern
Theneo #5 in API Documentation Tools 8.6/10 Free plan Free plan✓ 5 of 5 features Visit Theneo

Fern leads on 0 checks, Theneo on 0, and 6 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreFern · 9.4/10
  • Free planboth
  • Most featuresTheneo · 5 of 5

Fern scores higher on our rubric for api documentation tools: 9.4 against 8.6 out of 10; our editors rank them #1 and #5.

Fern is the better fit for teams needing broad hosted API documentation. Theneo is the better fit for collaborative teams using AI-assisted documentation.

  • Fern fits best

    Teams needing broad hosted API documentation

  • Theneo fits best

    Collaborative teams using AI-assisted documentation

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.

Side by side

Feature Fern 9.4/10 Visit ↗ Theneo 8.6/10 Visit ↗
At a glance
Editor score 9.4 8.6
Ranking #1 in API Documentation Tools #5 in API Documentation Tools
Best for Teams needing broad hosted API documentation Collaborative teams using AI-assisted documentation
Pricing model Free plan + paid Free plan + paid
Starting price — $120/mo
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Docs Email, Live chat, Docs
Compliance SOC 2 SOC 2, ISO 27001, GDPR, SSO/SAML, 2FA
Integrations 5 integrations 8 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Fern 1/5 · Theneo 5/5
OpenAPI import Not checked yet ✓ (best)
Interactive API reference Not checked yet ✓ (best)
Code samples Not checked yet ✓ (best)
API versioning Not checked yet ✓ (best)
Custom domain ✓ ✓
Specs
Hosting model Not checked yet Both
Our review
Pros
  • Supports OpenAPI, AsyncAPI, gRPC, GraphQL, and other API references
  • Free plan includes 1,000 pages, custom domains, and 10 team members
  • Offers versioning, analytics, access controls, and self-hosting
  • Interactive API Explorer, generated code samples, and API versioning
  • AI-assisted descriptions, changelogs, and real-time web editing
  • GitHub, Bitbucket, VS Code, Postman, Slack, and Teams integrations
Cons
  • Enterprise pricing is tailored rather than published as a fixed amount
  • Advanced controls and customization are tied to the Enterprise plan
  • Its broad feature set may exceed the needs of simple documentation projects
  • Starter is limited to one public project and two private projects
  • Custom domains and advanced access controls start with Business
  • Self-hosting, SAML SSO, and custom roles require Enterprise
Our verdict

Fern is a documentation platform for developers and teams publishing API references, guides, changelogs, and other technical content. It combines API specifications with Markdown or MDX to generate interactive documentation websites. The…

Read the review →

Theneo is an API documentation and developer portal platform for product, engineering, and developer-relations teams. It imports OpenAPI and other API specifications, then supports interactive references, guides, generated code samples,…

Read the review →
  1. FernAPI Documentation Tools 9.4Free plan
  2. TheneoAPI Documentation Tools 8.6Free plan

Strengths and trade-offs

  • Fern — where it wins

    • Supports OpenAPI, AsyncAPI, gRPC, GraphQL, and other API references
    • Free plan includes 1,000 pages, custom domains, and 10 team members
    • Offers versioning, analytics, access controls, and self-hosting

    Where it doesn't

    • Enterprise pricing is tailored rather than published as a fixed amount
    • Advanced controls and customization are tied to the Enterprise plan
    • Its broad feature set may exceed the needs of simple documentation projects

  • Theneo — where it wins

    • Interactive API Explorer, generated code samples, and API versioning
    • AI-assisted descriptions, changelogs, and real-time web editing
    • GitHub, Bitbucket, VS Code, Postman, Slack, and Teams integrations

    Where it doesn't

    • Starter is limited to one public project and two private projects
    • Custom domains and advanced access controls start with Business
    • Self-hosting, SAML SSO, and custom roles require Enterprise
  • Fern9.4/10 · Free plan

    A broad hosted API documentation platform with free entry and enterprise controls.

    Visit FernFull verdict →
  • Theneo8.6/10 · Free plan

    A collaborative API documentation platform with AI assistance, interactive references, and portal tooling.

    Visit TheneoFull verdict →

More comparisons

All API documentation tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update