The pro version of Android's tiniest Bluelight Filter. You can find the ad-free app here.

https://play.google.com/store/apps/details?id=com.panagola.app.bluef

This pro version comes with several extra features as listed below but is still just about 100kb install apk size!

1) Individual darkness setting for each color filter

2) Set multiple auto ON/OFF time slots

3) Use different filter colors for different times

4) Transparent widget option

5) Diagonal filter preview option

6) Several configuration options

Moreover our free version being ad-free you support our development when you buy this!