People living with type 1 usually know more about glucose than most apps do. What is missing is not general information: it is having what you ate, what you injected and what happened in one place, so the pattern shows up.
Every food carries its carbohydrates and its real serving, and the dishes you build add up their ingredients. If you repeat a meal, you save it once and it comes back with the numbers already done.
Log glucose, insulin and food with the time, and see them together. What is hard to spot in a notebook — that certain dinners always end the same way — becomes visible when all three sit on one screen.
Grams of carbohydrate do not tell the whole story: rice cooked and chilled raises glucose less than freshly cooked, instant oats more than steel-cut, and baked sweet potato nearly doubles the index of boiled. The app records the preparation, not just the food.
Several profiles in one account, with each phone choosing whose alerts it receives. A health reminder always says who it is about, because one account can belong to a whole household.