Help – Cleartune Review

My drummer showed me this app. Works perfectly on his Android. Instant response for tuning my guitar. BUT I just paid 4$ and downloaded it to my iPhone 6 and it is way less responsive...doesn’t even register my low E string. I chose this over the free apps because it worked so well on my drummers Android. What’s going on?? PLEEEEASE fix and update?
Review by Chris D 1983 ATX on Cleartune.