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Many existing brightness control apps use steps to change brightness - for example 0%-10%-20%-30% etc.
A drawback of such an approach is that when brightness changes from 10% to 20%, the screen becomes 2 times brighter; from 20 to 30 - 1.5 brighter, from 50 to 60 - 1.2 times brighter, and the difference between 90% and 100% can be difficult to see.
Our application used predefined brightness factors, and every touch of the -/+ buttons makes the screen 1.4, 1.5 or 2 times more (or less) bright. We hope that you will find this approach sensible and convenient.
In addition to the -/+ the app provides the slider which makes it possible to set brightness to any value. There are also Auto and Max buttons for situations when you quickly need to switch to the auto mode or set brightness to the maximum possible value (for example, when you are outside).