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Charles Proxy

Paid

HTTP/HTTPS debugging proxy — inspect, throttle, and rewrite requests, especially useful for mobile testing.

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Pricing

Paid

Type

Manual

// VERDICT

Reach for Charles when you need a proven cross-platform proxy to see and manipulate real HTTP/HTTPS traffic, including from mobile devices. Skip it when you want a free tool, a more modern UI, or an API client for authoring requests.

Best for

Inspecting, recording and rewriting live HTTP/HTTPS traffic between an app and the network - the long-standing cross-platform debugging proxy.

Avoid when

You want a free or modern-feeling tool, or you need to send/author requests rather than observe them.

CI/CD fit

Manual/interactive tool - not a CI fit

Team fit

Mobile QA · Developers debugging APIs · Testers inspecting live traffic

Setup

Medium

Maintenance

Low

Learning

Intermediate

Licence

Paid

// BEST FOR

  • Seeing exactly what requests and responses cross the wire, live
  • Debugging HTTPS traffic via SSL proxying after trusting its certificate
  • Inspecting traffic from mobile devices on the same network
  • Rewriting, mapping or throttling responses to test edge cases
  • Recording sessions and exporting them for analysis
  • Reproducing network conditions (slow/unstable) to test resilience

// AVOID WHEN

  • You want a free tool (Charles is paid)
  • You need to author and organise API requests (use a client)
  • You want a tool that runs in CI - this is interactive only
  • A more modern UI matters (Proxyman/HTTP Toolkit feel newer)
  • You only test on a server you control with full log access
  • Active security scanning is the goal (use Burp/ZAP)

// QUICK START

Install Charles -> enable SSL proxying -> trust the Charles root certificate
on your device/browser -> route traffic through the proxy and inspect.

// ALTERNATIVES TO CONSIDER

ToolChoose it when
ProxymanYou want a more modern, Mac-first proxy with a freemium tier.
FiddlerYou want a Windows-rooted proxy with a free tier.
HTTP ToolkitYou want a modern open-core proxy with one-click app interception.

// FEATURES

  • HTTP/HTTPS request and response inspection
  • SSL/TLS proxying with installed root cert
  • Bandwidth throttling presets (3G, 4G, etc.)
  • Breakpoints to pause and edit requests
  • Map Local and Map Remote for response substitution
  • Native macOS, Windows, and Linux apps

// PROS

  • Best-in-class for mobile network debugging
  • Friendly UI compared to mitmproxy/Wireshark
  • Throttling and breakpoints great for QA scenarios

// CONS

  • Paid licence required after trial
  • Throttling presets can feel imprecise
  • Single-developer maintenance — slower release cadence

// EXAMPLE QA WORKFLOW

  1. Route the app or device's traffic through Charles

  2. Enable SSL proxying and trust its certificate to decrypt HTTPS

  3. Inspect requests and responses live

  4. Use map/rewrite rules to simulate edge-case responses

  5. Throttle the connection to test slow-network behaviour

  6. Record and export the session for analysis