Hoping to provide the "just enough" system stats for users, N Stats is designed as an extremely simple real-time system stats monitor.
N Stats and it's today widget monitor three system stats:
* free memory
* free disk space
* network speed
Different colors are used to indicate different stats, and the color of each stat can be customized.
Today widget of N Stats is also included, and you can enable it in the Today view of Notification Center.
BTW, N Stats Ultra has been released, which support widget layout customization. Each stats can be optionally enabled and rearranged.