FlexColorScheme
A Flutter package to make and use beautiful color scheme based themes
... and easy to configure. When you theme a Flutter application correctly, all built-in widgets use the colors of the ColorScheme in your theme. At least in theory, and it is almost so if you defined your ThemeData by using the ThemeData.from factory, but it misses a few details. This applies in particular when you use Material-2 design in Flutter, which is the default. When you opt in on using Material-3, the color results and styles are much more consistent by default.