The pro version of Android's tiniest Bluelight Filter iBlue. 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 0.2 MB install apk size!

1) More color slots

2) Set multiple auto ON/OFF time slots

3) Individual darkness setting for each color filter

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