BucketsNavigation
The home screen is the search box. The rest is under Menu.
The home screen is a search box and its results. When the box is empty, your buckets are listed below it; tap one to see its contents.
Menu at the top right holds everything else: All buckets, Contacts, Photos, Calendar, Help and Settings.
All buckets shows one line per bucket with a count, in the order you sort by. A nested bucket stays indented under its parent in every sort order.
Every other screen has a ‹ arrow at the top left to return.