Things 3 is an $8 productivity app that's worth every penny

For those who like to stay organized, there are plenty of free apps out there that will get the job done.

But while those apps - including Apple's own native apps, like Calendar, Notes, and Reminders - are adequate, shelling out for a third-party app is often worth it.

Enter Things 3, an $8 app that's essentially the ultimate task manager. The app is simple to use, beautifully designed, and will help you finally get - and stay - organized.

The app launched in May and it's now the No. 1 paid productivity app in the App Store.

Here's how it works.