Using xDrip+ and Nightscout, calibrating xDrip+ properly to account for sensor inaccuracy on any given day (using a good meter) and using that system to make decisions that relate to your health requires significant learning to be sure you're doing it right. The official Libre 2 app is an approved http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=3444190