As best as I can find, Leaf is the best app for its purpose in the App Store. The ease and flexibility of adding new drinks makes it easy to use, and therefore more likely to be used. Personally, I could do without all the encouraging words — people might have a variety of reasons for wanting to count their drinks -- but I understand that supporting people is the mission of the organization, and of course it’s a free app. So I’m not going to complain about that.
I will, however, complain about the fact that in my hands, at least, the report function doesn’t work. And it looks like a really useful report function! So it’s a bit of a tease that it doesn’t work. Developers, I know it’s a free app, but please make the reports work!