Nagging is cheap. Respect is expensive. Habit products fail when they treat attention like a resource to extract.
Show progress without theater
Heatmaps and streaks work when they're honest. Fake fireworks for opening the app once teach the wrong lesson.
Watch is for moments, phone is for review
If it takes two hands and a password, it isn't a morning check-in. Watch surfaces should be tiny and kind. The phone can carry history and coaching.
Empty states are product
The first day of a habit app is the product. If day one feels like paperwork, day seven never arrives.