Whistle

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Freedom report

Two barsScore 5.8

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely6 of 6 device platforms
DocumentedPlans, terms and facts published

Whistle is ranked #7 of 27 in web debugging proxies on Freedom251. It runs on Android, iOS, Linux, macOS, Web, Windows.

Compared on web debugging proxies

Request/response editing: Yes
Traffic replay: Yes
Response mocking: Yes
WebSocket inspection: Yes
Proxy chaining: Yes

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The record

Product: Whistle describes itself as a cross-platform network debugging proxy for packet capture and debugging.
Proxy protocols: It supports HTTP, HTTPS, SOCKS and reverse proxying, and can intercept and modify network traffic.
Rule based editing: Users configure rules to modify requests and responses through an interface that also provides packet capture, plugin management and debugging tools.
Extensibility: Whistle functions can be extended through plugins, and Whistle can also be used as an NPM module dependency.
Desktop platforms: The desktop version supports macOS, Windows and Linux with a graphical interface.
Server environments: The command line version is intended for Linux servers without a graphical interface, Docker containers, embedded systems and IoT devices.
Capture tools: The Network interface supports real-time filtering of captured requests and offers request replay and editing through Composer.
WebSocket and TCP: Users can inspect WebSocket or TCP request and response data, pause or ignore transmission, and send custom data through Composer.
HTTPS capture: HTTPS traffic decryption requires enabling HTTPS capture and installing the Whistle root certificate.
Mobile devices: Whistle's mobile packet capture instructions cover iOS and Android devices configured to use the proxy and trust its root certificate.
Remote debugging: The integrated Weinre tool lets developers debug webpages on mobile devices from a computer on the same network.
Plugin hooks: Plugins can generate and issue HTTPS certificates, authenticate proxy requests, access request and response metadata, set rules dynamically, and handle forwarded requests.
Access control: The FAQ documents optional username and password authentication for Whistle's internal requests and says proxy request permission control requires a plugin or custom plugin development.
Maker attribution: The official site footer credits Aven Wu and shows copyright beginning in 2015; it does not state a headquarters location.

Where it ranks on Freedom251

Best Web Debugging Proxies in 2026#7 of 27

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Sources

wproxy.org/en/· checked 4 Oct 2026
wproxy.org/en/docs/· checked 4 Oct 2026
wproxy.org/en/docs/gui/network.html· checked 4 Oct 2026
wproxy.org/en/docs/gui/https.html· checked 4 Oct 2026
wproxy.org/en/docs/mobile.html· checked 4 Oct 2026
wproxy.org/en/docs/gui/weinre.html· checked 4 Oct 2026
wproxy.org/en/docs/extensions/usage.html· checked 4 Oct 2026
wproxy.org/en/docs/faq.html· checked 4 Oct 2026
wproxy.org/en/docs/extensions/npm.html· checked 5 Oct 2026
github.com/avwo/whistle/blob/master/README-en_US.m· checked 5 Oct 2026