From the Store description:
Denna is a todo list and task manager app that is dedicated for having best time management experience in whole windows devices. Just add your tasks and hobbies , share or swipe over to do or postpone them :) There are some cool features that will help you to act like successful people.
Here's Denna UWP in action:
Tha traditional opening intro screens - nicely done!
Entering a one off and (right) a repeating to do - easy and quick.
The timeline/overview shows what's left to do and coming up, and you can swipe left or right to mark as 'Done' or to 'Postpone' ;(right) there's no syncing to Denna on a laptop (etc.) but you can easily save your to-do database to the Cloud and restore it here or on any other Microsoft-signed-in device.
On larger screens - laptops, Continuum displays, Denna UWP needs work - most UI panes have far too little on them - no doubt the application will grow in scope in time!
You can grab this here in the Store. It's free!