U know when u were a kid n told not to state at the sun, well if u like potentially going blind, great app! Sometimes takes several tries to accept the scan n by then u are seeing spots for hours and then the interface is lame & can only add 3 entries with free version. I guess it would be great if the flash was optional bc there is sufficient lighting in every case I used it and set my camera flash to off n still requires the blinding flash from 4 inches away. Totally not ready for intended use. I give half a star for idea! Has potential but needs time.