Hindsight is an app made for iPhone and Apple Watch that remembers past events and calculates time intervals. It helps you stay on top of anything that needs doing regularly, without requiring you to plan ahead. It’s a simple tool to make navigating the fourth dimension a little easier.
Minimal & easy to use. Can sort items into categories - 1 layer of categories. I've been using it as my only tracker for everything now (supplements taken, when did I last water plants...etc)