2. Clear

On iTunes: itunes.apple.com
Price: $4.99
This app might not be free, but it's definitely worth the download! The app has a beautiful and elegant interface and is easy and quick for busy people! On the app you can create all different sorts of lists. You can try a personal to-do list, shopping list, guest list, bucket list, etc. With this app you'll simplify your life by organizing everything in just one place!