FilmFone Chroma is a filmmaking tool for phones used on movie or production sets. It features customizable chroma screens and markers/trackers for screen replacement. 

This serves as a more reliable alternative to static greenscreen and marker. The FilmFone Chroma app also allows actors to touch the screen and apply gestures without the content or markers being affected, as opposed to using a photo gallery app which will react to touches and swipes. Customizable marker sizes and opacities help finding the optimum setting for the camera settings, distance or focal length.