Nice Todo is the simplest way to remember things. It can lay always on top of your desktop so you will not miss any of your checklist items and it is always just one click away. It has 3 beautiful styles built-in and more to come! 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,
- elegant interface with 3 eye-candy styles and more to come,
- customizable window opacity and "always on top" option,
- built using newest technologies.

 

Compatibility: OS X 10.11 or later, 64-bit processor

More info - https://itunes.apple.com/us/app/nice-todo-a-cloud-synced-checklists-manager/id1143519256?mt=12&ign-mpt=uo%3D4