SystemPanel is a free and open-source tool that can help you to understand what's happening on your device. It provides a visual interface that makes it easy to see what's going on and how much time you're spending on each app.

This app can also help you to manage your device's usage and avoid overuse of specific apps or the device as a whole.

To help you use the tool, it offers a "Usage" tab, which displays the amount of time spent on each app and the total amount of time spent on the device. You can also use the tool to set specific limits for each app.

The tool can also help you to see the status of your phone's battery.