Superb Cleaner

Superb Cleaner is a lightweight and powerful maintenance app to clear your Android of all the junk files taking up unnecessary space. Also, it indirectly lets you cool down the CPU, which tends to get overheated on some devices.

Like almost all apps like it, Superb Cleaner has multiple tools to improve your device's performance. The main feature lets you close all the apps that are using resources (no matter how few) in the background. Of course, you can also create a list of exceptions so the apps you use most aren't affected.

Superb Cleaner is a simple maintenance tool that may not offer more features than similar apps, but it does present a good lightweight alternative.