Good but not great
Sync between two Apple devices does not work. App is hard to navigate. Website reports dont show daily carb summary and, even though there is a daily exercise report, there is no way to enter exercise data. This is a work in process, hopefully it will get better over time.
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CarbsControl - Carb Counter, Carbs Tracker, Nutrition tracker for Diabetes and Low Carb Diets, v7.1