UDP Monitor is a free Android application developed by SanderSoft under the Education & Reference category. As the name suggests, it is designed to monitor UDP packages to and from another host. The app has an easy-to-use chat interface that allows you to send and receive messages, configure the receiving port, and start listening.

One of the best features of UDP Monitor is the ability to visualize, write, and send messages in Natural Language, HEX, or ASCII representation. You can also configure the behavior and format for displayed messages, set notifications, and auto-start receiving on app startup. Additionally, you can ignore messages from specific IPs, program auto-responses, and clocked auto-send messages.

Another great aspect of UDP Monitor is the ability to control it from external apps using Broadcast Intents. You can save configuration profiles and load them whenever you need them. This makes it an excellent companion for network application development or monitoring messages from another host/program.

It's important to note that UDP Monitor requires a connection to a WIFI or mobile network to work and is not a Wireshark. Overall, UDP Monitor is a simple and versatile app that does exactly what it claims to do.