The app was crashing every time I tried to take a picture with it, but deleting the app and reinstalling it appears to fix the problem. The idea of this app is neat, but it has some shortcomings. You cant zoom in on your photos, so if there are multiple clouds in your field of view, its hard to isolate one from the group (particularly when shooting from a moving vehicle). I find the 20 questions-style Step-by-step Identifier kind of vague (What is "a distinctive shape"?), and it seems to often lead me to incorrect identifications. Its often easier to browse the cloud library to make an identification instead.