ReticleRanger is ranging tool for beginners and non math brains. It's an iPhone App and provided on an "as-is" basis. We make no claims that you will shoot better. No tool can replace the shooter triangle (shooter, rifle, projectile). We look forward to updating this app as frequently as we can for our users. If you need help or would like a new feature added to the ReticleRanger App or if you have any general inquiries please feel free to drop us a line here support(at)tufftech.co. Yes, it's .co not .com. Thank you.