Fiddler

Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet.

Free Windows

mitmproxy

mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP. It provides a console interface that allows traffic flows to be inspected and edited on the fly. It also...

Free Open Source Mac Windows Linux

Charles

Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet....

Commercial Mac Windows Linux

Zed Attack Proxy

The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications. It is designed to be used by people...

Free Open Source Mac Windows Linux

Burp Suite

Burp Suite is an integrated platform for performing security testing of web applications. Its various tools work seamlessly together to support the entire testing...

Freemium Mac Windows Linux BSD

HTTP Debugger

HTTP Debugger Pro - A Professional HTTP Sniffer and Analyzer for Developers

Commercial Windows

HttpWatch

HttpWatch is an HTTP viewer and debugger that integrates with IE and Firefox to provide seamless HTTP and HTTPS monitoring without leaving the browser window. It's...

Commercial Windows Firefox

Tamper Data

Firefox add-on that lets you change headers and request parameters before they're sent to the server. Unlike proxy request modifiers, it's integrated into the...

• Discontinued The extension is no longer developed since 2010 and it's not compatible with Firefox 57 and later. It still works on XUL-based Firefox forks like https://alternativeto.net/software/waterfox/ and https://alternativeto.net/software/palemoon/

Free Open Source Mac Windows Linux Firefox

apptalk.ninja

App and device communication diagnostics tool for better bug tracking & QA. An easy-to-use tool that monitors http, BLE and iBeacon communication over-the-air...

Freemium iPhone iPad

SecApps

Find security vulnerabilities right from your browser. Experience the next generation security tools without the need to install any additional software.

Freemium Mac Windows Linux Web Chrome OS

Andiparos

Andiparos is a fork of the famous Paros Proxy. It is an open source web application security assessment tool that gives penetration testers the ability to spider...

• Discontinued No longer developed, as of 2010: https://code.google.com/archive/p/andiparos/source/default/commits

Free Open Source Mac Windows Linux

HTTP Analyzer

HTTP Analyzer is such a handy tool that allows you to monitor, trace, debug and analyze HTTP/HTTPS traffic in real-time. It is used by industry-leading companies...

Commercial Windows