As a T1D dad it's great to see work like this, not least because it should raise the expectations of what we should expect from well funded engineering teams within the established players.

Right now it's not a great fit for my use case, in that one phone follows my 9 year old around, but the bulk of management happens on other phones on distinct accounts.

I agree with @jcims point about the permissions, greedily allowing write permissions to those data items up front feels like a real point of friction, I'd much prefer to see that done lazily at the point the user is enabling a feature that needs it.

Googling retwite I found this project on github: http://github.com/int/retwite and this discussion: https://groups.google.com/group/google-appengine/browse_thre...

It may have been constructed as a dumb mirror initially, but variants could be trivially reworked in to phishing sites.