Lumibee is powerful but simple photo editor for iOS. Film-like filters, live histogram, raw format supported all optimized for quick photo enhancements.
FilterGrade Alternatives
FilterGrade is described as 'Provides high quality post-processing tools to photographers and creative people all over the world. From subtle photoshop actions to intense light leaks and filters, FilterGrade creates beautiful tools to edit photos' and is an app in the photos & graphics category. There are more than 10 alternatives to FilterGrade for a variety of platforms, including iPhone, Android, Web-based, iPad and Android Tablet apps. The best FilterGrade alternative is Pixelfed, which is both free and Open Source. Other great apps like FilterGrade are Instagram, VSCO, Photoaster and Desktop for Instagram.