Scalar

Scalar is a developer platform for API docs, SDK generation, API testing, and registry workflows built on open standards like OpenAPI.

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Developer tools for API docs, SDKs, and clients

Scalar is a developer platform for API documentation, SDK generation, API testing, and API registry workflows. The site presents it as “The API Company” and centers the product around open standards, especially OpenAPI, with support also shown for AsyncAPI and JSON Schema in relevant products.

Across the product pages, Scalar positions its tools as a connected set: write docs, generate SDKs and clients, test APIs in an offline-first client, and keep outputs in sync with Git and the source API description. The platform is available through hosted experiences, the CLI, and desktop or browser-based client access depending on the product.

Core capabilities

Documentation authoring

Write product guides and API documentation in Markdown or MDX, mix in custom HTML/CSS/JS, and serve the result as hosted docs or through the CLI.

API references

Generate interactive API references from OpenAPI and AsyncAPI documents so documentation and API descriptions can stay aligned.

Git-based publishing

Keep documentation current with two-way Git sync, GitHub Actions, preview deployments, and publish workflows from a repository or the CLI.

SDK generation

Generate type-safe SDKs and CLIs from OpenAPI, with support for custom code, code samples, authentication, and file streaming.

API testing client

Use an offline-first API client to import OpenAPI descriptions, organize collections, run request scripts, and validate responses.

API registry

Manage OpenAPI documents with deep Git integration, CI/CD workflows, and registry-oriented publishing for teams that need versioned API assets.

Common ways teams use Scalar

Publish developer documentation
Use Docs to write guides in Markdown or MDX, combine them with API references, and publish from GitHub or the CLI while keeping the site in sync with the repository.
Generate client libraries from OpenAPI
Use SDK generation to turn an OpenAPI document into type-safe client libraries or CLIs, then manage updates when the API spec changes.
Test APIs interactively
Use API Client to import an OpenAPI description, send requests, organize collections, and add pre-request or post-response scripts for testing.
Manage API definitions in a registry
Use the registry workflow to manage and version OpenAPI documents with Git integration and CI/CD automation for teams maintaining shared API assets.
Coordinate API workflows across teams
Use the hosted and browser-based tools to collaborate across teams that need docs, client access, or preview deployments without building each piece separately.

Pros and Cons

Pros

Covers multiple API workflows in one product family, including docs, SDKs, API client, and registry.
Built around OpenAPI and related open standards, which makes the workflow source-driven rather than manual.
Supports Git-based publishing and synchronization, including GitHub Actions and CLI workflows.
Offers both hosted and local/offline-first usage patterns, depending on the product.
Includes language-specific SDK generation and API testing tools alongside documentation.

Cons

Pricing and capabilities vary by product and plan, so teams need to choose features carefully before adoption.
Some capabilities are only described at a high level on the public pages, so implementation details may require checking the individual product docs.

FAQ

What is Scalar Docs used for?

Scalar Docs is used to create and publish developer documentation with Markdown, MDX, OpenAPI, AsyncAPI, and two-way Git sync. It supports previews, GitHub Actions, and publishing from the CLI.

Is there a free plan?

Yes. The pricing page lists a Free plan with hosted OpenAPI docs and a built-in API client, and paid plans for Docs, SDKs, MCP servers, and developer portals.

What can Scalar SDKs generate?

Scalar SDKs generate type-safe client libraries from OpenAPI documents. The getting started page mentions TypeScript, Python, CLI targets, and more supported languages.

Which platforms does Scalar API Client support?

Scalar API Client is available in the browser and as desktop apps for macOS, Windows, and Linux. It is built around OpenAPI imports, collections, environments, and request/response testing.

What standards does Scalar support?

The source highlights OpenAPI and AsyncAPI support for docs, OpenAPI-based SDK generation, and an OpenAPI-native API client and registry. The pricing page also mentions JSON Schema support in the registry.