Can PC Digital Safe be used on a Samsung Android phone?
No, you can't use the application on a Samsung Android phone because the operating system that is running on that phone is not compatible with the application. Based on its description, PC Digital Safe is meant to be used only on Windows PCs. Besides, there are other applications you can use on Android similar to PC Digital Safe.
One of the apps is called CCleaner and allows you to clean and keep your phone running smoothly: https://play.google.com/store/apps/details?id=com.piriform.ccleaner
If you can't install CCleaner, use CleanMaster as an alternative: https://play.google.com/store/apps/details?id=com.cmcm.lite