The onboarding process was really jarring. I expected to be able to use it instantly. Instead, I had to wait ~30 seconds while my username was registered, and now I'm sitting on my hands waiting for some SMS with a code that will allow me to login. Also, there's no easy way for me to use the app with other people without inviting them first (which, given my circle of friends and family, would have to be preceded by a…
That's weird I didn't have to do an SMS code on Android.
iOS's sandboxing mechanism doesn't expose text messages to third-party apps.