リファインドデジタルカラーチェッカー

This is a site where you can check what are commonly known as RGB colors and the like. It automatically converts between four formats: HEX, RGB, HSV, and sRGB. It features color pattern generation (complementary colors, triadic and tetradic color schemes, etc.), contrast checking, a palette function that supports up to 20 colors with a lock feature, and QR code output for verification on actual mobile devices. I believe it has become a tool that can withstand practical use.