Best OpenAPI Generator Alternatives & Competitors in 2025

Swagger is an open source RESTapi Documentation Tool.

Open Source

API Transformer is a powerful solution that enables you to Transform API specifications to any format.

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Swagger Codegen can reduce the complexities that arise in your build process by providing client SDKs and server stubs for any API you want.

Swagger UI is a dependency-free collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation from a Swag

AutoRestCodeGenerator is an open-source OpenAPI (f.k.a Swagger) Specification code generator released under the MIT License that supports Python, C#, TypeScript, PowerShell, Go, Node.js, and Java.

Widdershins is an open-source, easy to use Semoasa/ OpenAPI/ AsyncAPI/ definition to ReSlate/Slate compatible markdown released under the MIT License.

API Spec Converter is an open-source solution that enables you to transform API descriptions between major formats like WADL, OpenAPI (fka Swagger), API Blueprint, RAML, and more.

A documentation generator for TypeScript projects

Open Source

Generate documentation from source code

The missing documentation tool for your Angular application

Open Source

NSwagCodeGenerator is a robust, highly useful, and open-source OpenAPI/Swagger toolchain for TypeScript, .NET, and ASP.NET Core.

Write Python with a spreadsheet

Open Source

An API documentation generator for JavaScript.

Open Source