Please note that the result values can have a deviation up to 20%. This is because the app uses the sensors of your smartphone and therefore it depends on their correctness!
Turn your phone into a seismometer. Measure the earthquake with your smartphone. Turn your smartphone into a earthquake laser meter and measure the quake. Surprise your friends and family by showing them how you measure the quake with a earthquake laser meter. Find out if there is a quake around you and get the intensity.
This app will help you in different situations or you can just play with it and measure with a earthquake laser meter.