Packet Capture Tool Comparison: Charles, Fiddler, TraceEagle, Wireshark, and Proxyman
Packet capture is one of the most common techniques developers use in daily debugging. There are many tools on the market, but each has a distinct positioning and applicable scenario, so choosing the right one can save a lot of time.
Charles: The Most Widely Used Proxy Packet Capture Tool
Charles has the largest user base for HTTP/HTTPS packet capture. Its advantage lies in its low learning curve—after installing it on a Mac, configuring the proxy on your phone, and installing the certificate, you can see the request list within minutes. It supports Breakpoint interception to modify requests, Repeat for replaying requests, and Map Local/Remote for request mapping. Once SSL Proxying is configured with the target domains, HTTPS traffic can also be decrypted.
Charles's limitations appear mainly in several scenarios: with SSL Pinning, proxy certificates are rejected by the client, leaving only handshake failure records; traffic from apps that ignore the system proxy is not captured; HTTP/3 and QUIC support is insufficient; and the certificate configuration flow on Windows is more complex than on Mac.
Fiddler: The Main Packet Capture Tool in the Windows Ecosystem
Fiddler is widely used on Windows. Its core strength is FiddlerScript—writing scripts in C# to customize request and response handling, which suits automated testing scenarios. It supports breakpoint debugging and request construction. A built-in performance analysis panel shows request latency and bandwidth usage.
Fiddler's shortcomings are also obvious: on macOS only a limited-feature Beta version exists, and Windows remains the primary platform; HTTPS decryption requires manually configuring certificates, with more steps than Charles; the interface feels dated, and filtering is less convenient when handling large volumes of data.
TraceEagle: Covers More Edge Cases
TraceEagle takes a different approach from the tools mentioned above. It builds on proxy-based capture and fills the blind spots of other tools: apps that ignore the system proxy can be captured directly from the network interface or via in-app stream extraction; in SSL Pinning scenarios, there is no need to swap certificates in the middle—plaintext can be obtained directly from inside the app; HTTP/3 and QUIC are handled via three modes: downgrade capture, fidelity transparent passthrough, and actual decryption.
The workflow after packets are captured is also more complete—you can set breakpoints and modify requests in the same interface, right-click to run load tests and view p99 tail latency, compare differences line by line, and reverse-engineer OpenAPI documents. It supports packet capture on iOS without jailbreak and on Android without installing certificates, and runs on Windows, macOS, and Linux.
Wireshark: The Most Comprehensive Protocol Analyzer
Wireshark is unrivaled in the depth of protocol analysis, supporting parsing of thousands of protocols. Its filter expressions are powerful, allowing you to combine source IP, port, protocol, and other conditions to locate specific traffic. It is the standard tool for troubleshooting TCP retransmissions and TLS handshake details.
To capture iOS mobile traffic with Wireshark, you need to use the rvictl command on a Mac to create a virtual interface; it cannot be used directly on Windows. Moreover, Wireshark does not handle HTTPS decryption—you must export keys separately. For everyday API debugging, Wireshark's operational workflow is longer than that of proxy-based tools.
Proxyman: A Modern Choice on macOS
Proxyman is a packet capture tool that has become popular on macOS in recent years. Its interface is more modern than Charles and Fiddler, and the visual configuration for request filtering rules is more intuitive. It supports grouping by domain, advanced search, and script extensions. In SSL Pinning scenarios, it can be solved by installing a root certificate together with iOS's SSL Kill Switch.
Proxyman's limitation is that it supports macOS only, so Windows users cannot use it. HTTP/3 support is also limited. Its deep analysis capability and script flexibility are not as strong as Fiddler's.
Selection Recommendations
For simple HTTP API debugging in daily work, Charles or Proxyman is sufficient. In Windows environments where scripting capability is required, choose Fiddler. For deep dives into the TCP protocol layer, Wireshark is a must. When encountering edge cases such as certificate pinning, HTTP/3, or proprietary protocols in a project, adding TraceEagle to your toolchain fills in the blind spots.