Colour
#178FA1
- #178FA1
- Cyan
- Dark
- Nearest: Dark cyan
#178FA1 is a cyan with RGB values 23, 143, 161 and HSL 188°, 75%, 36%. It is a dark colour, so black text on it reaches 5.5:1 contrast (AA for normal text). The nearest named colour is Dark cyan.
Colour values
#178FA1#178FA1
HEX#178FA1
RGBrgb(23, 143, 161)
RGB (0–1)0.0902, 0.5608, 0.6314
RGB percentages9%, 56.1%, 63.1%
HSLhsl(187.8, 75%, 36.1%)
HSV / HSBhsv(187.8, 85.7%, 63.1%)
CMYK85.7%, 11.2%, 0%, 36.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,544,097
CSS custom property--colour: #178FA1;
Brightness & contrast
Relative luminance0.224WCAG 2.x, 0 is black and 1 is white
Perceived brightness123 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.48:1
Contrast with white3.83:1WCAG normal text: Fail
Contrast with black5.48:1WCAG normal text: AA
Greyscale equivalent#777777
Inverted#E8705E
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.83:1WCAG large text: AA
Contrast with black, large text5.48:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#A12917
Analogous#17A16E, #174AA1
Triadic#A1178F, #8FA117
Split complementary#A1174A, #A16E17
Tetradic#6E17A1, #A12917, #4AA117
Tints, shades & saturation
Channel breakdown
R23
G143
B161
Red23 (9%)
Green143 (56.1%)
Blue161 (63.1%)
Hue187.83°
Saturation (HSL)75%
Lightness36.08%
Dominant channelBlue
Hex per channelR 17 · G 8F · B A1
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