I came across this wonderful tool made by artist Richard Robinson – The Gamut Mask which is free from his site  http://www.livepaintinglessons.com/gamutmask.php

Easy to use with any medium, digital or traditional. This cool colour wheel allows for a huge range of palettes to bring harmony to your work. Dont forget I love to see What you create using any of the tools featured on my blog, from my custom brushes & palettes to apps etc ive found useful in my own work. I think i might feature some of it here, so send me your best projects! ❤️🦁🎨