I recently switched from an iPhone running Ballistic AE to an Android running Shooter, Strelok, and Applied Ballistics. I prefer Ballistic AE to all others. Applied Ballistics and Shooter are 99% the same app. I bought Applied Ballistics because Litz seems to listen to what people want in the same way the owner of Ballistic AE does. They all do the job as long as you put the correct info in.