Yes there is a lot of good competition already established in the tuner app area already, so its a daunting market to enter.

A lot of time was spent getting the pitch detection algorithm just right so you get a accurate and stable reading but get it quickly. This was more challenging that I first thought it would be.

Also I felt it would be good to be able to use the pitch pipe without having to keep shifting back and forth between the instrument and guitar for each string so I added an automatic mode where it plays the nearest note back based on the one you played.

So, hopefully this app will prove a worthy contender