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Scalar
Modern, open-source interactive OpenAPI references and API clients designed for beautiful developer experiences.
About Scalar
Scalar is an open-source API documentation tool and API client that focuses on delivering beautiful, highly interactive OpenAPI references out of the box. It is designed to be easily embeddable and highly customizable, allowing teams to generate modern API references using standard OpenAPI specifications without writing complex frontend code.
The platform provides a seamless docs-as-code experience, supporting Markdown and MDX for extended documentation. Scalar also integrates an offline-first API client directly into the documentation, enabling developers to test endpoints, manage environments, and generate code snippets seamlessly from the reference interface.
Key Features
- Interactive References: Beautiful, responsive API documentation generated from OpenAPI/Swagger.
- Integrated API Client: Built-in REST client for testing endpoints directly in the browser.
- Open-Source Core: Fully open-source components for rendering and API testing.
- Offline First: The API client and workspace function effectively offline.
- Multi-Language Code Snippets: Automatically generates client code for dozens of languages.
- Universal Framework Support: Easy integration with Vue, React, Fastify, Hono, and other modern frameworks.
Pricing
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Open Source: $0 Free to use, self-host, and embed via npm or CDNs.
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Pro / Hosted: Pricing not publicly specified. Scalar offers premium hosted solutions and advanced team collaboration features, but specific commercial tiers require contacting their sales or viewing internal dashboard tiers.
Use Cases
- Generating beautiful, modern API references
- Providing an integrated API testing client
- Embedding API documentation in modern web apps
- Open-source docs-as-code deployments
Pros & Cons
Pros:
- Stunning, modern default UI
- Excellent integrated API client for testing
- Strong open-source community and framework support
Cons:
- Newer platform compared to legacy competitors
- Enterprise governance features are still evolving
Integrations
Vue, React, Hono, Fastify, NestJS, GitHub
FAQ
Is Scalar open-source?
Yes, Scalar’s core API reference renderer and API client are open-source and free to use.
What specifications does Scalar support?
Scalar supports OpenAPI 3.1, OpenAPI 3.0, and Swagger 2.0.
Can I use Scalar without a backend?
Yes, you can use Scalar via a CDN or npm package to render an OpenAPI file purely on the frontend.
Does it include an API client?
Yes, Scalar includes an integrated, offline-first API client directly inside the documentation interface.
Last edited
November 3, 2026 at 7:28 AM by Venkatraman Chandrasekaran
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