Great app for tracking insulin, meals, exercise, etc all in one place. Bluetooth works with the Accu-Chek connect series or you can do manual entry of glucose levels. Won't take 0 as an insulin input. 1 star rating is because they have made no attempt to fix the location issues for years, just hook it to Google Maps for restaurants, etc. Would be nice if you could connect to apps like Withings Health Mate or MyFitnessPal.