You might want to additionally split this by: - Free v paid/iAPS - How expensive the app is No doubt there's other ways to split it (e.g. "controversy level", "complexity") but those are potentially a bit tricky to quantify.
If it gets a decent amount of use it might be fun to add some more hashtags to let people break it down more.
Again, if it gets decent data coming through it there might be some nice things I can do with visualisation of that data too. We will see ;)