mitmproxy vs Whistle

mitmproxy9.4Visit Whistle8.6Visit

Higher score mitmproxy #1 in Web Debugging Proxies 9.4/10 Free plan Free plan✓ 6 of 6 features Visit mitmproxy

vs

Whistle #7 in Web Debugging Proxies 8.6/10 Open source ✓ 5 of 6 features Visit Whistle

• mitmproxy fits best

  Teams wanting a free, programmable proxy

• Whistle fits best

  Open-source teams needing flexible proxy modes

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Side by side

Feature	mitmproxy 9.4/10 Visit ↗	Whistle 8.6/10 Visit ↗
At a glance
Editor score	9.4	8.6
Ranking	#1 in Web Debugging Proxies	#7 in Web Debugging Proxies
Best for	Teams wanting a free, programmable proxy	Open-source teams needing flexible proxy modes
Pricing model	Free	Free
Starting price	Free plan	Open source
Free plan	✓ (best)	Not checked yet
Free trial	—	—
Deployment	Desktop, Browser extension, Self-hosted	Desktop, Self-hosted
Platforms	Web, Windows, macOS, Linux	Web, Windows, macOS, Linux
Support	Community, Docs	Docs, Community
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market
Features mitmproxy 6/6 · Whistle 5/6
Request/response editing	✓	✓
Breakpoint rules	✓ (best)	Not checked yet
Traffic replay	✓	✓
Response mocking	✓	✓
WebSocket inspection	✓	✓
Proxy chaining	✓	✓
Specs
Platforms	Not checked yet	Not checked yet
Our review
Pros	Covers HTTP/1, HTTP/2, HTTP/3, HTTPS, and WebSockets Combines browser, command-line, and Python addon interfaces Supports replay, mocking, recording, and upstream proxy chaining	Captures and modifies HTTP, HTTPS, HTTP/2, WebSocket, and TCP traffic Supports proxy modes, replay, custom requests, and response mocking Runs across macOS, Windows, Linux, and headless environments
Cons	No AI-assisted features The web interface runs as part of the local mitmproxy tool Advanced automation requires Python-based scripted addons	Dedicated breakpoint rules are not established as a feature Its workflow centers on proxy traffic rather than general app observability Protocol and interface expansion relies on plugins
Our verdict	mitmproxy is a free, open-source intercepting proxy for developers, testers, security researchers, and privacy analysts. It captures, inspects, modifies, records, and replays network traffic through command-line, browser-based, and Python… Read the review →	Whistle is an open-source network debugging proxy for developers and technical teams working across desktop, browser, and command-line environments. It captures and modifies HTTP, HTTPS, HTTP/2, WebSocket, and TCP traffic, while also… Read the review →

Strengths and trade-offs

• mitmproxy — where it wins

  • Covers HTTP/1, HTTP/2, HTTP/3, HTTPS, and WebSockets
  • Combines browser, command-line, and Python addon interfaces
  • Supports replay, mocking, recording, and upstream proxy chaining

  Where it doesn't

  • No AI-assisted features
  • The web interface runs as part of the local mitmproxy tool
  • Advanced automation requires Python-based scripted addons

• Whistle — where it wins

  • Captures and modifies HTTP, HTTPS, HTTP/2, WebSocket, and TCP traffic
  • Supports proxy modes, replay, custom requests, and response mocking
  • Runs across macOS, Windows, Linux, and headless environments

  Where it doesn't

  • Dedicated breakpoint rules are not established as a feature
  • Its workflow centers on proxy traffic rather than general app observability
  • Protocol and interface expansion relies on plugins

• mitmproxy9.4/10 · Free plan

  A broad, programmable proxy for debugging HTTP, HTTPS, WebSockets, and related traffic.

  Visit mitmproxyFull verdict →
• Whistle8.6/10 · Open source

  A flexible open-source proxy for inspecting, replaying, and mocking network traffic.

  Visit WhistleFull verdict →