Cool but not useful
If it had been free it would have gotten a 3 since it’s a cool idea but since it’s not free and pretty much useless as a tool it gets a 1. What I mean by useless is that someone with OK eyesight will be able to see just as much without the app and phone. It’s like your normal nightvision but with a added green filter. So, go for the free apps and try them out first!