Egern is a feature-rich networking tool developed by BYTE CROSSING LTD for iPhone users. It excels in proxying, intercepting, and modifying network traffic with a robust set of features.

With Egern, users can comprehensively record TCP, UDP, DNS, and HTTP network traffic. The tool supports various rule types such as domain, domain keywords, URL regular expressions, and more. It offers flexible policy group options like automatic testing, load balancing, and external policies.

One standout feature of Egern is its ability to effortlessly decrypt HTTPS traffic using Man-in-the-Middle attack techniques. It also provides URL rewriting, customizable request and response header rewriting, versatile content rewriting, and JavaScript support for customized operations on data.