The concept is fantastic, but unfortunately isn’t programmed well. It gives an error each time I add a piece to my collection, no matter what is selected. It then appears to be in my collection, but, after exiting the app and coming back in, what was added is no longer showing. It’s impossible for me to save anything new to my collection which makes the app useless to me. I have reached out to the app creator and she was helpful at first, stating that she would work with the developers, but she is now unresponsive after I let he know the problems are still occurring. I REALLY want to use this app, and paid $20 for it. Unfortunately it just doesn’t work. Do not spend money on this until the issues have been corrected.