The only problem with using any app. is the fact that no matter how fine the code is written, at the end of the day your still at the mercy of whatever your using collect data. In this case, conduct the vibrations to your device. All vibratometers I know of come with a dedicated "probe" just for vibrations. So what your doing is basically trusting the 23 cent microphone in your phone. Would you trust a frequency analyzer app to do room correction? If you do your probably going to have a dead spot below 40 Hertze. Why? Because your phones mic cannot read at that level. And then there's the accuracy. Ha ha, I wont even go there. Do you see my point? And I do trust my math. The last time I looked 2+2 still equals 4. So there IS that! Now, let's say you've spent the $1,500.00 bucks on the dedicated probe. The resolution of given app is about enough to tell you if there is a minor earth tremor or not. Not quite what you'd need to measure the nano-vibrations that are affecting your turntable, amp or Pre. If this was THAT easy everyone would be doing it! And I'd be bored.