If you are a kind of person who wants to add notifications fast and easy, without filling a million of fields - SmallTask is the right app for you.
This application is a Mac OS X client for SmallTask app for iPhone and iPad. It allows you to keep all your tasks synchronized with iOS devices using iCloud. Once you create new task on Mac, you will automatically get it on your iPhone/iPad.
Using SmallTask, you can add new task in a moment, just type the name and choose the date of notification. When task is completed - you can easily delete it and will disappear from the list.
You can also use Yosemite widget to manage your existing tasks or add new. Please note that the widget is unable to create sound notifications, you will need to launch the main app to schedule them.
Wonderfully easy and a joy to use, Simple Task lives up to its name and makes task management across multiple devices a breeze.