Photowall for Chromecast is a new iOS app by Google which allows people to "collaborate with images" on their Chromecast-connected TVs. Chromecast owners can use the new app to doodle and comment on images before beaming them to their televisions to share with other Photowall users. The app also allows anyone to add photos to the montage, and it automatically uploads your Photowall creations to YouTube for easier sharing.
Photowall for Chromecast is available for iOS devices only. It is free to download from the App Store and it is compatible with all devices running iOS 6.0 or higher.