Not very useful. While the limited info is accurate bits very basic. Better off getting a guide with more information.
Offers really basic information
Great little app for the basics you forgot you knew
Real nice. Does exactly what it advertises
All the info All the information you forgot you learned from school. An excellent resource for IT proffesional's, I will be recommending it to my friends.
Memeory leak for Android < 6.0 devices fixed.
Necessary security update.