From The Omni Group:
OmniFocus for iPhone 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. We've refreshed the entire user interface for iOS 7. We've also gone deeper and reorganized some of the navigation to make it easier and more natural for you to quickly get ideas from your head to this app, and update them as you make progress towards your goals. Use OmniFocus for iPhone on its own, or sync through the cloud with your other devices running OmniFocus (also available for iPad and Mac). Syncs can even happen when you're not actively using OmniFocus, so that your information is ready when you are.