Paint.grid is well designed, powerful and simply app for pixel art artists or for platform game designers. It uses full potential of your screen, because it has no full filled bars on top or bottom, even main panel of app is able to hide and don't mess around.

Colors, they're important.
You can choose them by picking them by your finger, by selecting one you used, by 3 sliders RGB or by hexadecimal value.

You can easily export your painting to PNG format or saving for later work.