One is a $140 digital scanner while the other is a free app called SlideScan. The app is unique in that all you need to scan your slides is your iPhone or Android. It works really well, but we found that the process is more time consuming and the final results could be hit or miss. As for the digital scanner, it is more expensive since it requires you to purchase the equipment (the model we tested is $140), but the final results speak for themselves. The scanner is fast and efficient and you don’t have to waste any time...