I also have the Hornady app and also Strelok Pro, Revic Ops, and GeoBallistics. I tried some others also and later deleted them as being too cumbersome to easily use. The Hornady app does not have many bullet profiles - at least I couldn't find Sierras, Barnes and many other bullet descriptions. Consequently, I had to search the internet to get the info and type it into the Hornady app. I like Strelok Pro the best by far because it has most bullets already cataloged for easy download and thousands of scope reticles loaded. Most other apps don't have reticles. I think Kestral is a waste of money and just more weight to carry and adds more complications like batteries, storage, etc. for little benefit if any. Your phone has weather data and you can buy a wind vane for your phone much cheaper. Kestrel only tells you the wind where you're standing and not the winds at the target or along the bullet's flight path so pretty worthless in my opinion.