The app works by changing around the image in a way that the way you have to move your fingers is different each time. I.e. it turns, distorts, moves and mirrors the image in different ways. This way the smears get mixed up and it's pretty much impossible for someone who sees your hand movements to guess your login. Of course, it may also require a bit more brain power on your side.
Let me know how it goes for you! Note: I had to set it up twice before it actually started to work on my phone. And it will request admin priviledges to be able to unlock your screen without being set to root.
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