What are some of the mobile apps that have awesome UX?

[kristenchua]

Like out of all the application you used, which application would you say that it give you the best user experience? Just some fun fact, I am a Iphone user so I am not very familiar with android platform.:\

 

[BlueWeasel]

A few that come to mind that I use frequently.

Day One (journal app)
Fantastical 2 (calendar)