Great cleaning app for those who don't wish to waste time going through settings and deleting cache files themselves. As others have said, this app does run heavy on lighter phones so if you have one I would still download it but make sure that when using it you close it down afterward. It can hibernate some apps as well, in turn, lowering ram usage that way too. The four-star rating comes from the fact that it can use a lot of ram itself which contradicts its purpose at times.