The best HTTP(S) Debugger alternative to API Tester is Fiddler, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to API Tester and five of them are HTTP(S) Debuggers so hopefully you can find a suitable replacement. Other interesting HTTP(S) Debugger alternatives to API Tester are Hoppscotch, HTTP Toolkit, Proxyman and HttpMaster.
Web Debugging Proxy that logs all HTTP(S) traffic for comprehensive analysis. It allows manipulation of traffic, supports scripting, and extends with .NET. Debugs virtually any application, implementing man-in-the-middle interception with self-signed certificates. Freeware, ideal for developers.
Hoppscotch is an open-source API development ecosystem. It helps you create your requests faster, saving you precious time on your development.
HTTP Toolkit is a beautiful, cross-platform & open-source HTTP(S) debugging proxy, analyzer & client, with built-in support for modern tools and automatic interception for clients from Docker to Android to iOS.
Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains. Available on macOS, iOS, Windows & Linux.
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