#3F00C7 Hex Color
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#3f00c7 is a dark, saturated indigo that sits between blue and violet. Its low lightness and strong saturation read moody and electric rather than muted. It works best as a dominant base in dark mode interfaces, night sky scenes, and luxury branding, and it flatters warm accents like soft gold or burnt peach more than the usual grays. White text on #3f00c7 hits about 10.3:1 contrast, well past WCAG AA for body copy.
Questions about #3f00c7
What is #3f00c7 in RGB, HSL and CMYK?
In RGB, #3f00c7 is rgb(63, 0, 199), in HSL hsl(259, 100%, 39%) and in CMYK 68%, 100%, 0%, 22%.
What colors pair well with #3f00c7?
Warm tones flatter #3f00c7 best. Soft gold, peach, and terracotta lift its violet cast, while cool grays tend to flatten it into plain navy. For dark palettes, let it anchor 60% of the layout and keep warm accents small.
Is #3f00c7 readable on white or black?
#3f00c7 has a 10.31:1 contrast ratio on white and 2.03:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it works for body text and on black it is too faint for text. Try other pairs in the contrast checker.