Can I exclude apps from the effects of Booster?

Yes. The first time you use Booster from the side menu, you are prompted to use the Memory Booster Check which enables you to untick any apps that you do not want to be affected by the Boost Memory feature. By default, all non-system apps are ticked. Turn the Memory Booster Check option cleanup3_on_16.png ON in your CCleaner Android settings so that each time you run a boost, you can review which apps will be affected and untick any that you do not want to be stopped on that occasion.