Todoey is the simplest way to remember things. It sits in your menubar so it is always just one click away. It blends perfectly into your macOS desktop in both dark and light theme. It also syncs using iCloud so you will be always backed up and up to date on all your Macs. Features:

fast and lightweight, easy to use, support for multiple checklists, iCloud sync, blends perfectly in you macOS in both dark and light themes.