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Fern vs Theneo: Features, Pricing and User Reviews 2026

Compare features, pricing, reviews, and more to make an informed decision

Try Fern
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Fern

Fern generates production-ready SDKs and beautiful API documentation automatically from your OpenAPI specification for multiple programming languages.

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API Documentation ToolsOpenAPI Documentation Tools
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Try Theneo
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Theneo

Theneo creates beautiful, interactive API documentation using AI technology to help developers build Stripe-like docs in seconds.

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Fern

  • Automatic SDK generation in 8+ programming languages

  • Stripe-style API documentation websites

  • Direct publishing to package registries

  • OpenAPI and AsyncAPI support

  • Interactive API playground with live testing

  • Custom branding and domain support

  • Built-in OAuth 2.0 and authentication

  • Automatic pagination and retry logic

  • WebSocket and SSE support

  • Version control with Git

  • AI-powered search assistant

  • Open source on GitHub

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Theneo

  • AI-powered documentation generation from API specs

  • Interactive API testing and exploration

  • Real-time team collaboration and editing

  • Custom branding and developer portal creation

  • Automatic changelog and version tracking

  • GitHub and VS Code integrations

  • Multiple API format support (OpenAPI, Postman, GraphQL)

  • Enterprise security with SSO and self-hosting

  • Custom domains and advanced styling options

Fern logo

Fern

Fern offers separate pricing for SDKs and documentation to fit different team needs.

For SDK generation, there are three tiers available:

  • Basic Plan ($250/month per SDK): Supports up to 50 endpoints with REST API support, automated publishing, and schema validation. Billed annually.

  • Pro Plan ($600/month per SDK): Includes up to 150 endpoints, WebSockets, webhooks, dedicated Slack support, and advanced features like pagination and OAuth. Billed annually.

  • Enterprise Plan (Custom pricing): Offers unlimited endpoints, SDK migration services, enterprise support with SLAs, GitHub issue monitoring, and custom code maintenance.

For documentation, pricing includes:

  • Basic Plan ($400/month): Stripe-like API reference, API playground, custom domain, and built-in components. Billed annually.

  • Pro Plan ($1,000/month): Everything in Basic plus custom React components, authenticated docs, role-based access control, and AI search capabilities. Billed annually.

  • Enterprise Plan (Custom pricing): Includes white-glove content migration, custom integrations, SSO authentication, design services, and enterprise support.

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Theneo

Theneo offers flexible pricing plans to suit different team sizes and needs. The platform starts with a generous free plan and scales up for larger organizations.

  • Free Plan: Includes 1 public project, 2 private projects, up to 20 team members, 100 AI-powered search results, and 2,000 AI assistance instances. Perfect for small teams and personal projects.

  • Business Plan ($150/month): Supports up to 7 projects, 50 team members, unlimited AI usage, custom branding, custom domain, and one developer portal. Ideal for growing companies.

  • Growth Plan ($400/month): Everything in Business plus up to 20 projects, custom CSS and JavaScript, advanced analytics, up to 20 developer hubs, and priority support.

  • Enterprise Plan (Custom pricing): Includes self-hosting, SSO integration, unlimited projects, custom user roles, advanced security features, and dedicated support for large organizations.