Changing my previous response
The issue with payment was resolved, it was AppStore quite weird way of issuing of invoice. I use the application several days now and it is very convenient, no need to think and calculate, just 1 photo and it is done. I’m not sure how accurate it is, but the thing is that previously I did it manually in another application and did it as well approximately. So I think it is good to have something quick just to give a view on eating habit and managing it.