Online Color Picker Tool
One of the quickest way to come up with the right colors is to use ColorPicker. Simple, but with all the necessary features, it has hex input, a color slider and the ability to save colors to a palette. You can also choose from generated palettes with complementary, triade, tetrade and analogic colors. The only thing that may make this tool even better would be to add the ability to change the background color of the page itself.
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