dont waste your money

this app appears as an icon that provides a yellow screen only for a google browser. it does not protect eyes on any other window on my iPhone6.

get gamer, clear (not yellow) glasses for as low as $17 on amazon. i opted for a phone screen cover to block blue light on my phone for $55. TV and electronics and sunlight all have blue light. extended exposure causes dry eye, a condition that over time can cause cornea pitting. blue light in evening hours may also mess with your sleep.

you can add clear (no longer yellow only) blulight filter with uv-a and uv-b to your prescription eyeglasses.

jbhatesgoogle about Unblue