Alternatives to Postman

Free Screen & Device Tests Online | Private Browser Diagnostics

Programmable CI/CD pipelines as code in Go, Python, TypeScript, or Java. Runs locally and on any CI provider.

Microsofts open-source end-to-end browser testing framework for Chromium, Firefox, and WebKit with one API.

Git-friendly, fully offline API client that stores collections as plain text files in your repository.

Hybrid CI/CD where the control plane is hosted but the build agents run on your own infrastructure.

Open-source workshop for building UI components in isolation. Preview, document, and test them outside the app.

Hosted continuous integration that runs your test suite in parallel containers across Linux, macOS, Windows, and ARM.

Open-source API client for REST, GraphQL, gRPC, and WebSockets. Postmans more polished, less corporate cousin.

Java testing framework that brings Spring Boot conventions and Playwright APIs to Selenium

Automatically investigate failing Playwright tests and open pull requests with fixes

WebSocket testing tools, protocol guides, and a Chrome extension for developers

Trace, grade and share proof that your AI agent actually works