What's the best iOS app for monitoring and filtering my iPhone's internet traffic?

Surge 5 is a sophisticated networking utility designed for users who require extensive oversight and management of their device's internet traffic. The app functions as a local HTTP/HTTPS/SOCKS5 proxy server, capturing and logging every network request made by the device. For monitoring, it offers a detailed request list showing domains, IP addresses, and data usage in real-time, which is invaluable for identifying bandwidth-heavy apps or spotting suspicious connections. Its core strength for filtering lies in a highly configurable rule-based system. Users can create rules to block ads, redirect traffic through specific proxies based on the destination, or even modify request and response headers. This level of control is particularly useful for developers debugging API calls, privacy-conscious users blocking trackers, or anyone needing to enforce a specific network path for certain services. However, the app's power comes with complexity; its interface and configuration are not designed for casual users and assume a working knowledge of networking concepts. Reviews indicate the initial setup can be daunting, but the payoff for power users is significant. The app's main limitation is that advanced features like MITM decryption for HTTPS traffic require installing and trusting a custom certificate, a process that may give some users pause. Overall, for granular network monitoring and rule-based filtering on iOS, Surge 5 offers a level of access rarely seen on the platform.