Package Sniffer is an Android app developed by Fırat Parlak that provides two primary functions: proxy and packet capturing. It allows you to specify the network request made by other apps on your phone to go through the proxy server you designated. Moreover, it can capture IP packets and store them in a pcap format, which can be opened by Wireshark.

To use Package Sniffer, you need to download the apk and install it on your Android phone. Then, you can add apps you need for proxy or capturing into traffic control. If you're using the proxy, you may need to add your proxy server in the settings panel. After that, click the start button on the main page to start traffic control. If you want to stop packet capturing, you can click the stop button or wait until the pcap file exceeds the limitation of 10MB. Once the capturing stops, the pcap file will be located in the path configured in the settings panel. You can pull it out and open it with Wireshark or Charles.

Overall, Package Sniffer is a useful tool for those who want to monitor network traffic on their Android devices without rooting them. It is also a free app, making it accessible to everyone who needs it.