UPDATE: The developers were quick to respond, and the sync seems to work now. In fact, updates happen within seconds. I’m changing my review to 5 stars. Outliner does exactly what it says it does, it does it well, and I’m quite happy with it.
ORIGINAL: The screenshots advertise “pick up where you left off,” but you cannot. There is no cloud sync of any sort. I cannot get my iPhone, iPad, or Mac to sync with one another, which means Outliner is useless to me. Would have given it 2 stars, but I’m taking a star off for deceptive claims of a non-existent sync feature.