SmartDNS Client is a free Android app developed by Ignacio Capurro that provides a convenient way to use the SmartDNS Proxy service. This app allows users to select primary and secondary DNS servers and automatically trigger IP updates at connection time, without the need for device rooting.

The app's interface is simple and user-friendly, with clear instructions on how to use it. You can easily switch between DNS servers, and the app will automatically update your IP address. However, to trigger the IP update, you will need to obtain the service ID associated with your account from the SmartDNS Proxy website.

Overall, SmartDNS Client is an excellent utility app for Android users who want to use the SmartDNS Proxy service. It's easy to use, does not require device rooting, and provides a convenient way to switch between DNS servers.