Android: If you aren't satisfied with how Android controls your device's screen brightness (is anyone?), Lux is a simple alternative that is easy to configure, while still offering a lot of options.
Tagged With brightness
Android: We all know that screen brightness has a huge effect on your phone's battery life, but Android's built in auto-brightness setting isn't always accurate, and doesn't offer anything in the way of customisation. Velis Auto Brightness on the other hand oozes customisability, and gives you in-depth control over your screen's brightness.
Twilight is an Android app that automatically adjusts your device's brightness (technically, its colour temperature) over the course of the day, reducing the harsh whites and blues as the day progresses. We've talked about how to avoid eyestrain at the computer, but when you're not staring at a computer screen, you're probably looking at your phone or tablet, and Twilight can help.
Mac only: Free utility Shades adds finer screen brightness controls to your Mac than the defaults. Once you install the Shades Preference pane and turn it on, you can brighten or darken your screen across a much wider range than the Mac's built-in controls, and make your laptop in bed much more bearable to your sleepy significant other or the guy on the red-eye flight in the next seat. Shades doesn't affect OS X's default controls and colour profiles. If you get carried away by the range Shades provides and dim your screen too dark, Alt+Esc will set it back to the default brightness. Thanks eyeRmonkey! Shades