All Samsung smartphones from 2015 going forward arrived with this app, Smart Manager, preloaded. I think it is worth checking out if one has a Samsung smartphone. This is what Samsung says of the app's functionality:
The Smart Manager application lets you manage your device's battery life, storage, RAM usage, and security all in one place.
I have used Smart Manager on the Galaxy J5, J7 and Note 5 and it actually does all of the above. Since it is preloaded, it is easy to try it out. And it doesn't try to be fishy like the others. Those were review devices though. My old Note 3 doesn't have Smart Manager so I'm out here keeping my mind open and shopping for options.