#183F40 Hex Color
Online color picker to view shades, tints, color codes, and complementary colors
#183f40 is a dark, heavily muted cyan with smoky blue-green undertones. Its low lightness creates a serious, mysterious mood, while subtle cyan keeps interfaces feeling fresh. Use it as a dominant dark-mode background or pair it with muted coral and warm cream. White text reaches about 11.5:1 contrast, making this hex code suitable for readable body text.
Questions about #183f40
What is #183f40 in RGB, HSL and CMYK?
In RGB, #183f40 is rgb(24, 63, 64), in HSL hsl(182, 45%, 17%) and in CMYK 63%, 2%, 0%, 75%.
What colors pair well with #183f40?
Muted coral, warm cream, and soft neutrals pair well with #183f40, balancing its deep blue-green base without overpowering its restrained mood. Use pale warm tones for contrast, with terracotta as an earthy accent.
Does #183f40 feel warm or cool?
#183f40 reads as a cool color because its dark base leans toward cyan and blue-green, though its heavy muting keeps it from feeling icy. That balance gives layouts a calm, serious, and slightly mysterious character.
Is #183f40 readable on white or black?
#183f40 has a 11.51:1 contrast ratio on white and 1.82:1 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.