Colormind uses 'deep learning' to generate different colour palettes and schemes.
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Coolors.io is a colour scheme generator that allows you to both create, and explore, a range of palettes.
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A very useful and speedy resource for quickly finding beautiful gradients. Also gives hex codes and full screen preview.
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Adobe Color, formerly Kuler, is such a powerful tool for both discovering and creating colour palettes that compliment, contrast or compound.
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