Could be great but its not
This app could be absolute best tool to scan old negatives. Very fast and very easy. From the first look it seems to have all great tools like auto border detection, perspective correction+auto crop and color correction. But from the second look - the quality is so bad due to applied digital zoom. There is no possibility to use other iphone lenses and while using external macro lens, all features except color correction are off so you have to crop all photos one by one manually (or if you are lucky to have exact macro lens to just fit the frame, you have to carefully allign the camera to the frame - so the fast and easy scanning is gone.