Fern vs Mintlify: Features, Pricing and User Reviews 2026

Fern

Auto-Generate SDKs and API Documentation

API Documentation OpenAPI Documentation

Mintlify

AI-Powered Documentation Platform for Developers

API Documentation Developer Documentation Platforms+1 more

Fern

Auto-Generate SDKs and API Documentation

API Documentation OpenAPI Documentation

Mintlify

AI-Powered Documentation Platform for Developers

API Documentation Developer Documentation Platforms+1 more

Fern

Fern is a platform that automatically generates SDKs and API documentation from your API definition. You provide your OpenAPI, AsyncAPI, or gRPC specification, and Fern creates ready-to-use client libraries in languages like TypeScript, Python, Go, Java, Ruby, C#, PHP, and Swift.

The platform also builds documentation websites that look professional and match your brand identity. These sites include interactive API references, code examples, and a playground where developers can test your API without leaving the documentation.

Fern is open source and available on GitHub. It integrates with your existing workflow by publishing SDKs directly to package registries like npm and PyPI. The tool is designed for companies that want to provide a great developer experience without dedicating engineering resources to manual SDK maintenance.

Mintlify

Mintlify is a documentation platform that transforms markdown files into polished, interactive websites. It works by connecting to your code repository and automatically building documentation sites whenever you make changes. The platform includes an AI assistant that helps write content, suggests improvements, and answers user questions directly in the docs.

Unlike traditional documentation tools that require coding knowledge and complex setup, Mintlify provides ready-to-use components and templates. You get features like API playgrounds, search functionality, and mobile-responsive designs without extra work. The platform also includes analytics so you can see which pages users visit most and where they struggle. There is a free plan for individuals and paid plans for teams that need collaboration features and advanced AI capabilities.

Features of Fern and Mintlify

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

Mintlify

AI-powered writing and chat assistance
Interactive API documentation playground
Real-time web-based content editor
Custom domain and branding options
GitHub and GitLab integration
Advanced analytics and user tracking
Multi-language localization support
Mobile-responsive design templates
Search functionality with AI answers
Password-protected documentation
Preview deployments for testing
Team collaboration tools

Use Cases of Fern and Mintlify

Fern

Documentation Content Management API Documentation Creation SDK Documentation Generation OpenAPI Specification Documentation

Mintlify

Documentation Content Management API Documentation Creation Developer Portal Building Documentation Site Deployment Git-Integrated Documentation AI-Optimized Documentation

Pricing of Fern and Mintlify

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.

Mintlify

Mintlify offers flexible pricing to suit different team sizes and needs. The platform provides a free plan and paid options with advanced features.

The Hobby plan is completely free and includes the full platform with custom domain, web editor, API playground, analytics dashboard, and MCP server. This is perfect for individual developers and open-source projects.

The Pro plan costs around $250-300 per month depending on whether you pay annually or monthly. It includes everything in Hobby plus team member invites, AI assistant, preview deployments, password protection, and styling checks. This plan supports up to 5 team members with additional members available for extra cost.

For larger organizations, Mintlify offers Custom Enterprise plans with advanced features like custom authentication, 99.999% uptime guarantee, user permissions, support agreements, and single sign-on. Contact their sales team for pricing details.