And one last nitpick/question. It looks like the app requires a connection? Was it simply easier to develop, or did you want to simplify the sign up process by tying users' settings to their email? It would obviously be much better if this worked in Airplane mode. However, it's not a dealbreaker, and the unusually low friction of getting set up may be worth it (in fact, if that were the goal, I think it's kinda genius).
groups.google.com/group/hn-parents
I vaguely recall there being a discussion on it a while ago about this.
Seems like the group is invite only (my signup is pending for approval). If you have a minute, would be great if you could help me post the link there, otherwise I'll wait for the approval and do it later.