The best alternatives to Colorado are Coolors, Color Hunt, and Klart. If these 3 options don't work for you, we've listed a few more alternatives below.
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blackbird is a high-contrast color scheme for computer programmers. Inspired by the famous SR-71 blackbird plane, the colors are easy to look at, have a high-contrast bright, and have the perfect amount of saturation. There are implementations for vim, vscode, and a number of terminal emulators.