mitmproxy vs Fiddler Classic

mitmproxy8.9Visit FCFiddler Classic8.5Visit

Higher score mitmproxy #2 in Local Development Proxy Tools 8.9/10 Free plan Free plan✓ 1 of 4 features Visit mitmproxy

vs

FC Fiddler Classic #5 in Local Development Proxy Tools 8.5/10 Free plan Free plan✓ 3 of 4 features Try Fiddler Classic

• mitmproxy fits best

  Developers wanting a free, scriptable proxy toolkit

• Fiddler Classic fits best

  Windows users debugging traffic for non-commercial use

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Side by side

Feature	mitmproxy 8.9/10 Visit ↗	FCFiddler Classic 8.5/10 Visit ↗
At a glance
Editor score	8.9	8.5
Ranking	#2 in Local Development Proxy Tools	#5 in Local Development Proxy Tools
Best for	Developers wanting a free, scriptable proxy toolkit	Windows users debugging traffic for non-commercial use
Pricing model	Free	Free
Starting price	Free plan	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop, Browser extension, Self-hosted	Desktop
Platforms	Web, Windows, macOS, Linux	Windows
Support	Community, Docs	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise	Solo
Features mitmproxy 1/4 · Fiddler Classic 3/4
HTTPS interception	Not checked yet	✓ (best)
Edit requests and responses	✓	✓
Mobile app debugging	Not checked yet	Not checked yet
API debugging tools	Not checked yet	✓ (best)
Specs
Supported platforms	Not checked yet	Windows
Our review
Pros	Inspects HTTP through HTTP/3 traffic and WebSocket messages Edits traffic interactively and supports replay and response mocking Offers browser, command-line, and Python addon interfaces	Logs and inspects HTTP(S) traffic from browsers and desktop apps API Composer lets developers compose HTTP/S requests AutoResponder can mock responses and modify traffic
Cons	Requires running a local tool; mitmweb is not a hosted service Python addons require scripting for automated traffic transformations Support is through community resources and documentation	Windows-only desktop availability limits platform fit Free use is limited to personal and other permitted non-commercial use Maintenance mode means it is not in active development
Our verdict	mitmproxy is a free, open-source intercepting proxy for developers, testers, security researchers, and privacy analysts who need to examine or change network traffic. It covers HTTP, HTTPS, HTTP/1, HTTP/2, HTTP/3, and WebSockets, with… Read the review →	Fiddler Classic is a Windows desktop proxy for developers who need to inspect and debug HTTP(S) traffic from browsers and desktop apps. It logs network traffic and provides tools to compose requests, mock responses, and modify traffic. Its… Read the review →

Strengths and trade-offs

• mitmproxy — where it wins

  • Inspects HTTP through HTTP/3 traffic and WebSocket messages
  • Edits traffic interactively and supports replay and response mocking
  • Offers browser, command-line, and Python addon interfaces

  Where it doesn't

  • Requires running a local tool; mitmweb is not a hosted service
  • Python addons require scripting for automated traffic transformations
  • Support is through community resources and documentation

• Fiddler Classic — where it wins

  • Logs and inspects HTTP(S) traffic from browsers and desktop apps
  • API Composer lets developers compose HTTP/S requests
  • AutoResponder can mock responses and modify traffic

  Where it doesn't

  • Windows-only desktop availability limits platform fit
  • Free use is limited to personal and other permitted non-commercial use
  • Maintenance mode means it is not in active development

• mitmproxy8.9/10 · Free plan

  A scriptable proxy toolkit for inspecting, editing, replaying, and mocking web traffic.

  Visit mitmproxyFull verdict →
• FCFiddler Classic8.5/10 · Free plan

  A free Windows proxy for inspecting, composing, mocking, and modifying HTTP(S) traffic.

  Try Fiddler ClassicFull verdict →