Scalar

Scalar is a modern, open-source developer experience platform designed to document, test, and discover APIs. It provides a comprehensive suite of tools that transform standard OpenAPI/Swagger files into world-class, interactive API documentation. The platform is trusted by a wide range of users, from startups to Fortune 500 companies, for its power, flexibility, and developer-centric approach.

At its core, Scalar generates beautiful and highly functional API references. These documents are not static; they include an interactive playground that allows developers and users to test API endpoints directly within the browser. This seamless integration of documentation and testing significantly reduces onboarding time and simplifies the development workflow. The platform also includes a powerful Swagger Editor, enabling users to preview, edit, and manage their OpenAPI specifications with ease.

How to use Scalar

Getting started with Scalar is straightforward. Developers can begin by importing an existing OpenAPI/Swagger file (versions 3.1, 3.0, and 2.0 are supported) or by creating one from scratch using the integrated Swagger Editor. Once the specification is loaded, Scalar automatically generates the interactive documentation.

For integration into projects, Scalar offers packages for numerous frameworks like .NET, Fastify, Next.js, Laravel, Express, and more. A simple command, such as dotnet add package Scalar.AspNetCore, is often all that's needed. From there, developers can add a few lines of code to their application to serve the Scalar API reference documentation. The platform also provides a standalone, offline-first API Client available for Web, macOS, Linux, and Windows, which can be used independently or in conjunction with the documentation for robust API testing.

Core Features of Scalar

• Interactive API Documentation: Automatically generates beautiful, user-friendly API docs from OpenAPI/Swagger files with a built-in testing playground.
• Integrated API Client: A powerful, offline-first REST API client available on all major desktop platforms for comprehensive API testing and debugging.
• Swagger Editor: A free, open-source tool to preview, edit, and manage Swagger/OAS files directly within the platform.
• Extensive Customization: Offers full brandability with custom themes, colors, typography, and the ability to add custom CSS/JavaScript, even on the free plan.
• Framework Integrations: Provides easy-to-use packages for a wide variety of popular backend frameworks, including .NET, Nitro, FastAPI, Hono, NestJS, and more.
• Git + Markdown Sync: Allows documentation to live alongside code, supporting docs written in Markdown linked to OpenAPI files.
• Open-Source Core: Built by and for the community, ensuring transparency, continuous improvement, and no vendor lock-in.
• Code Sample Generation: Automatically creates code samples in various popular programming languages to help users consume the API.

Use Cases for Scalar

Scalar is ideal for any individual or team that builds, maintains, or consumes APIs. A primary use case is for companies looking to provide exceptional developer experiences for their public or internal APIs. For example, companies like Supabase, Maersk, and Tailscale use Scalar to power their API documentation. It's also perfect for individual developers who need a quick and easy way to visualize and test an API they are working on. Teams can use the collaboration features in the Pro plan to sync API testing workspaces and ensure consistency across the development lifecycle.

Advantages of Scalar

Scalar's main advantage is its seamless integration of documentation and testing into a single, cohesive platform. Unlike other tools that separate these functions, Scalar allows users to read about an endpoint and immediately test it without leaving the page. Its open-source nature and commitment to the OpenAPI specification prevent vendor lock-in. The high degree of customization allows companies to maintain brand consistency. Furthermore, its offline-first API client is a significant benefit for developers who need to work without a constant internet connection. The generous free plan makes it accessible to everyone, while the affordable Pro plan offers powerful features for professional teams.

Pricing and Plans

Scalar offers a flexible, freemium pricing model:

• Free Plan: Includes 1 user, unlimited workspaces, free subdomains (on apidocumentation.com), API references, full styling with themes and custom CSS/JS, and the built-in Scalar API Client.
• Pro Plan ($12 per seat/month): Includes everything in the Free plan, plus custom domains, sync with GitHub, guides & versions, advanced search (powered by TypeSense), and priority support.
• Enterprise Plan (Custom Pricing): Includes all Pro features, plus SSO/SAML, monthly documentation audits, verified workspaces, and a dedicated Slack channel for support.