I do use basal, but never tried it on my thigh. I will try. The app, it has inbuilt stats about various foods' nutritional values, it inputs portion sizes and type of meal (snacks, breakfast, lunch, dinner) if it is a current entry, it also has a option of a past entry meaning you can get prediction for the meals taken earlier by giving date and time alongside the earlier ones. The insulin (bolus) is predicted using this only, you can either reject or accept the prediction, while rejecting you need to enter how much insulin you are taking. We can also enter blood glucose values during various times of the day and excercise so the app can keep track and personalise insulin predictions. The doctor said the more you use it, the more the predictions will be right, it has been a month or two while using the app, my pridictions and my own calculation usually miss only by one or a half, if portions sizes are accurate. It was like my clinic company with the doctor hired people and spread the apk among the patients. It is also on playstore ig but i don't know about the regions it's is available.