Modern HTTP debugging tool, Debug, mock, and rewrite HTTP/HTTPS traffic with composable rules.
Cost / License
- Freemium
- Proprietary
Platforms
- Mac
- Windows
- Linux




Fiddler is described as 'Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and "fiddle" with incoming or outgoing data' and is a very popular http(s) debugger in the network & admin category. There are more than 50 alternatives to Fiddler for a variety of platforms, including Windows, Mac, Linux, Web-based and iPhone apps. The best Fiddler alternative is Charles. It's not free, so if you're looking for a free alternative, you could try mitmproxy or HTTP Toolkit. Other great apps like Fiddler are Proxyman, Burp Suite, HTTP Debugger and Zed Attack Proxy (ZAP).
Modern HTTP debugging tool, Debug, mock, and rewrite HTTP/HTTPS traffic with composable rules.




Scan your APIs for prompt injection and 12 security checks in less than a minute, MCP, CLI and GH Action ready to CI/DI integration.






Free, open-source Fiddler Classic alternative for Windows. Capture, inspect, filter, replay, compose and mock HTTP/HTTPS traffic with TLS decryption, HTTP/2, HTTP/3 and SAZ support.



Timesketch is an open-source tool for collaborative forensic timeline analysis. Using sketches you and your collaborators can easily organize your timelines and analyze them all at the same time. Add meaning to your raw data with rich annotations, comments, tags and stars.




