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Track all applications that transmit and receive data over the network.

Set stop and access points, work with incoming and outgoing data. Check outgoing requests and HTTP responses. View request and response headers, as well as cookie data and parameters that are transmitted to the server. Use an AutoResponder, and replace server scripts with your local scripts to simplify editing and debugging the script.


  • Constant data updates
  • Minimum resource consumption
  • AutoResponder


  • Sometimes, it works slowly
  • Occasionally, it doesn't show any traffic
  • Developed by Eric Lawrence
  • File name: fiddler4setup.exe (1.2 MB)
  • Latest version: 5.0.20204
  • License: Free
  • Updated: December 06, 2020
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