Pixel is a simple tool that lets you remember the colours you love. Just open the app, aim at the target, and tap anywhere to save the colour in RGB format.
It also gives you a real-time RGB values of what youre looking at, and allows you to increase the aperture of the area you want to measure. Its easy to access the colours youve saved, which you can then use however you like, from mixing paint to choosing the colour of your car.