The link to charitywater.org is broken at the bottom of https://habitify.co/how.html

My advice: Since there's a Mac version Habitify does not depend on mobile device functionality, so it might be worth considering a web version to broaden the potential customer pipeline [I am assuming based on the donation model requiring Habitify to track users' points that there is already a web component].

To me, other advantages of a web implementation are challenging assumptions about users and pulling utility and functionality out from the rituals of programming against Apple's API's and for the constraints of iTunes Store.

Good luck.