ReadableColorGen is described as 'Html color generator and color picker focused into readability/accessibility of text and background combinations. It helps with html, stylesheet(css) and web design' and is an app in the Development category. There are more than 10 alternatives to ReadableColorGen for a variety of platforms, including Online / Web-based, Windows, Mac, Linux and iPhone. The best alternative is Just Color Picker, which is free. Other great apps like ReadableColorGen are gcolor2 (Free, Open Source), Pipette (Free Personal), Colormind (Free) and ColorImpact (Paid).
gcolor2 is a basic colourpicker utility that allows you to select any colour on your screen, and, well, grab it's colour. It also allows you to save the colour you create to a file, which shows up as a list in the application.
With the pipette you are able to edit, convert and pick up colors from your screen. Pipette also supports a lot of standards or color models (RGB, CMY, CMYK, HSV, TColor and XYZ0). Color models are nothing but theoretical descriptions of colors using certain numeric values.
Pika (pronounced pi·kuh, like picker) is an easy to use, open-source, native colour picker for macOS. Pika makes it simple to quickly find colours on screen, in the format you need, so you can get on with being a speedy, successful designer.
ColorMixer is a powerful application for mixing colors. You choose a color and ColorMixer will calculate 8 harmonic colors based on the one you’ve chosen. It’s user interface offers lots of utilities to choose colors.