If you are the type that loves to keep an eye on how much work your phone is doing during the day, you are going to have to check out System Monitor. The name doesn’t say a lot, but this Holo-inspired app is an incredibly versatile tool for keeping track of your CPU, RAM, I/O, network signals and applications all at the same time. Swiping between each graph is silky smooth, plus they update in real time. All of these features are included in the free version of the app, but paying $1.99 gets you even more enhanced goodies.
The paid version unlocks awesome features like notifications, which can be expanded if you are running Jelly Bean. You can even add a floating graph so you can keep track of your phone’s CPU or RAM usage while using another app. When you’re looking at your CPU usage, you can split it up and see how much each individual processor of your phone is working. If you’re a user of Dashclock, the paid version can export notifications right to your lockscreen as well.
Overall, this app is extremely polished and robust for a very low price. We highly suggest you give it a look.