iOS: Wunderlist has long been one of the best to-do managers and yesterday the iPhone version got a little better.
The first thing you'll notice after updating is a refined interface. The home view now shows you more lists by reducing the profile picture in the top. When you tap on a list, you can easily see the details. iPhone 6s users also get support for 3D Touch with a quick add feature from the home screen and Peek and Pop in the app, where you can take a peek at to-do details and reschedule deadlines.
Wunderlist (Free) [iTunes App Store]