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 https://www.saludcapital.gov.co/sitios/VigilanciaSaludPublica/Lists/Contactenos/DispForm.aspx?ID=2972663