Shift does not have a mobile app. However, we are always looking at ways to expand the use of Shift in people's lives, which extends to mobile applications.
We are currently evaluating the development of mobile applications for both iOS and Android but have not made a firm commitment at this time. We understand the importance of bringing the Shift experience to the mobile platform, but we are currently focused on making it the best productivity suite for Windows, Mac, and Linux.
Please click here to vote on including this feature in a future release.