Misleading. – Horizon Camera Review

All this app does is crop a wide landscape angle over what you are shooting. So if you hold it portrait it merely chops off enough of the top and bottom of your shot creating the wider effect. The issue with this is you don't get the same shot as holding your phone landscape. Furthermore, since it crops a smaller area, the resolution isn't the same as it would be if shot in landscape. This is a cheap and poor way of doing it.
Review by Suboh on Horizon Camera.