Fern vs Stoplight: Features, Pricing and User Reviews 2026

Fern

Auto-Generate SDKs and API Documentation

API Documentation OpenAPI Documentation

Stoplight

Visual API Design and Documentation

API Documentation Developer Portal Builders+1 more

Fern

Auto-Generate SDKs and API Documentation

API Documentation OpenAPI Documentation

Stoplight

Visual API Design and Documentation

API Documentation Developer Portal Builders+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.

Stoplight

Stoplight is a web-based platform for API design and management that follows a design-first philosophy. This means you plan and design your API before writing any code, which saves time and reduces errors during development.

The platform includes Stoplight Studio, a visual editor that lets you create API designs using forms instead of code. It supports OpenAPI and JSON Schema standards, which are widely used in the industry. You can work directly with files in your Git repository, making it easy to fit into your existing workflow.

Stoplight automatically generates beautiful documentation from your API designs, creates mock servers for testing, and provides validation tools to catch errors early. It works as a cloud service but also offers desktop and web versions.

Features of Fern and Stoplight

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

Stoplight

Visual OpenAPI editor with no-code interface
Automatic interactive documentation generation
Instant mock servers with Prism
API style guides and linting with Spectral
Git repository integration (GitHub, GitLab, Bitbucket, Azure DevOps)
Team collaboration with comments and reviews
Reusable components and schemas
Multi-branch support
Custom domains and branding
Component libraries for governance
LDAP and SAML SSO support

Use Cases of Fern and Stoplight

Fern

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

Stoplight

Documentation Content Management API Documentation Creation OpenAPI Specification Documentation API Endpoint Mocking API Endpoint Testing

Pricing of Fern and Stoplight

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.

Stoplight

Stoplight offers plans designed for different team sizes and needs:

The Basic Plan starts at $52 per month and includes the first 3 users for free, with additional users at $13 each. This plan provides the OpenAPI visual designer, interactive documentation, and instant mock servers. It includes a 14-day free trial.

The Startup Plan costs $137 monthly with 8 free users included. Additional users cost $13 each. This adds private projects, multi-branch support, custom domains, theming options, and Google Analytics integration.

The Pro Team Plan is $423 per month with 15 users included at $25 per additional user. It supports up to 20 teams and includes shared style guides, workspace groups, self-hosted Git providers, activity logs, LDAP and SAML SSO, and component libraries.

For larger organizations, Enterprise Plans offer custom pricing with unlimited projects and teams, flexible payment terms, invoicing, and priority support.