Ever had a small vibration motor you wanted to test spin-up on, but couldn't figure out what equipment to use? Well now you can just use your iPhone!

The Vibration App from Diffraction Limited Design LLC allows you to put a motor on your phone, then uses the accelerometer to sense different information about it as it spins up. Their blog post on the app provides more information on usage and features.

Go forth and put vibrators on your phone!