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Open Source Postman Alternatives

Discover 8 open source alternatives to Postman. All free, community-driven, and actively maintained.

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What is Postman?

API development platform for building, testing, and documenting APIs.

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playwright
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playwright

Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.

hoppscotch
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hoppscotch

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

API Client
bruno
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bruno

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

API Client
insomnia
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insomnia

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

API Client
openapi-generator
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openapi-generator

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

API
scalar
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scalar

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

API Client
requestly
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requestly

Free and open-source API Client & Interceptor.

API Client
awesome-api-devtools
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awesome-api-devtools

:books: A collection of useful resources for building RESTful HTTP+JSON APIs.