This is the Software Publisher's description.
OmniFocus brings task management to your fingertips. Keep track of tasks by project, place, person, or date. With OmniFocus for iPhone, you'll always have your important information at hand, whether it's a shopping list, agenda items to discuss at work, things to do at home—whatever you need.
Use OmniFocus for iPhone on its own, or sync through the cloud with your other devices running OmniFocus (also available for iPad and Mac).