If you want to take a look at your system resource usage occasionally and don't want the app taking too much space of your Status Bar or Dock, then N Stats is for you.

N Stats is a clean and handy real-time system stats monitor. You can enable the N Stats widget in Today view of Notification Center, and it only take a small space of Notification Center. The N Stats widget will work even when the N Stats main app is not running.

N Stats monitor these system stats
- CPU usage
- Memory usage
- Disk usage
- Network speed

Different colors are used to indicate different stats, and color of each stat can be customized to the one you preferred.

Any feedback is appreciated.