Surge

Surge provides a proxy‑based environment for inspecting and modifying web traffic on iOS 9 devices and macOS. It intercepts HTTP and HTTPS requests, allowing developers to view headers, bodies, and response data in real time. The tool also supports custom rules for rewriting URLs, injecting scripts, and simulating network conditions, enabling detailed testing of web applications on mobile platforms.

The utility is designed for web developers who need to debug site behavior directly on iOS 9 without requiring separate hardware or emulators. By running on macOS, it can act as a bridge between a desktop debugging interface and the mobile device, simplifying the workflow for testing responsive layouts, API calls, and security configurations.

Surge’s distinctive feature is its integration of a full‑featured debugging proxy with a macOS application, offering a unified interface for both desktop and iOS traffic analysis. This combination makes it a practical solution for developers targeting legacy iOS environments.