Live RAM Monitor show RAM usage over all the screens as a floating overlay text box as well on notification area. So you can monitor the RAM usage while using the other applications as well.
For Example you can monitor your device's RAM usage while playing games, surfing on browser, playing videos etc.

The application show the graphical view of RAM usage

The application track and show the maximum used RAM

The application also provides the feature to change the overlay text box properties like text box position, text color, text background color, text size, transparency