The Hidden Controls in the iPhone's Camera App - GatorTec - Apple Premier Partner | Sales & Service of Mac, iPads, iPhones, Apple Watch, AppleTV, and More!
Cadrage Director's Viewfinder on the App Store
Does your iPhone need a viewfinder?: Digital Photography Review
Cadrage - the better director's viewfinder app | CineD
Download Cadrage Director's Viewfinder app for iPhone and iPad
Viewfinder - Luminous Landscape
Contour Launches Connect View Card and Viewfinder App - Pinkbike
PhotoCineView: a Director's Viewfinder for iOS and Android smartphones by Jose Antunes - ProVideo Coalition