Apidog vs Scalar

Apidog is an all-in-one API development platform that puts design, debugging, testing, mocking and documentation in one tool, so a team works from a single OpenAPI-based source of truth instead of passing specs between Swagger, Postman and a docs site. It runs in the browser and as desktop apps for macOS, Windows and Linux, and it markets itself directly as a cheaper Postman alternative.

Designers build endpoints and JSON Schemas in a visual editor; developers send requests over HTTP, GraphQL, gRPC, WebSocket, SOAP and SSE with Postman-compatible scripts; QA builds visual test scenarios, scheduled runs and performance tests; schema-driven mocks need no code; and interactive docs publish with custom domains. Sprint branches, Git connection, a CLI for CI/CD and self-hosted runners round it out. The free plan covers up to four users; Basic, Professional and Enterprise are billed per member, and documentation readers are free.

It fits teams that want to replace Postman plus a separate docs and mock tool. Stoplight and Redocly are stronger for pure design governance, ReadMe and Mintlify produce more polished public developer portals, and Postman has the larger ecosystem. Apidog's mock and docs features are less mature for large public API programs.

Recent releases focus on AI: an MCP server that feeds API specs to Cursor and other AI editors, an MCP client and AI agent debugger, AI test case generation and schema compliance checks. Apidog also offers an EU data region and an on-premises edition. Import a Postman collection during the 14-day trial to compare.

Scalar is an open-source platform for API documentation and testing built around the OpenAPI standard. Its best-known product is the Scalar API Reference, a modern, interactive reference page generated from an OpenAPI or Swagger file, with a built-in API client so readers can send real requests from the docs instead of copying curl commands.

The reference can be dropped into a project with a script tag or through integrations for frameworks such as ASP.NET Core, FastAPI, Express, NestJS, Hono and Laravel, which is why it is often used as a modern replacement for Swagger UI. Microsoft's ASP.NET Core documentation lists Scalar as one way to display OpenAPI documents after Swashbuckle was removed from the default template in .NET 9. The Scalar API Client is also available as a standalone app for testing endpoints, similar to Postman. On top of the open-source tools, Scalar offers a hosted platform for publishing API references and guides with custom domains, themes and team features on a paid plan.

Scalar fits developers and startups that want polished API references with minimal setup and no licence cost. It is younger than established players, enterprise developer portal features such as analytics, access control and monetisation are still developing, and the community is smaller. Swagger UI and Redoc are the classic free renderers, Mintlify and ReadMe are full hosted documentation platforms, and Postman is the dominant API client.