letZi is a multi-device photo viewer for iPhone and iPad. With letZi ("let see") you can show photos to nearby friends. On their devices. You control the slideshow, they enjoy photos full screen. It's like having multiple prints of your pictures. Everyone sees the same picture at the same time and can join the discussion.
letZi also works well to pitch iOS projects or to show progress on the design and development of an iOS application. Just add screenshots or mockups to your iPhone photo library and use letZi to show these to your client.
Your clients get to see these on their devices. The way their app will look once it is completed. You get to pilot the demo / slideshow to follow your narrative. With everyone looking at the same screenshot at the same time there is no confusion about what you or someone else is referring to.