There is no unit converter, you can copy the result or formula to clipboard by long pressing it.

The text color of the widget can be customized, as well as the color and the alpha of the background. Press the result or formula in the widget to open the app.

Contains no ads or unnecessary permissions. It is fully opensource, provides customizable colors.

This app is just one piece of a bigger series of apps. You can find the rest of them at www.simplemobiletools.com
From version Simple Calculator 4.0.0:
Allow changing the app launcher icon color
Added a FAQ item about clearing chars
Added a Settings button for changing widget colors without recreating it
All versions
April 3, 2018