Colour
#178E7B
- #178E7B
- Cyan
- Dark
- Nearest: Dark cyan
#178E7B is a cyan with RGB values 23, 142, 123 and HSL 170°, 72%, 32%. It is a dark colour, so black text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Dark cyan.
Colour values
#178E7B#178E7B
HEX#178E7B
RGBrgb(23, 142, 123)
RGB (0–1)0.0902, 0.5569, 0.4824
RGB percentages9%, 55.7%, 48.2%
HSLhsl(170.4, 72.1%, 32.4%)
HSV / HSBhsv(170.4, 83.8%, 55.7%)
CMYK83.8%, 0%, 13.4%, 44.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,543,803
CSS custom property--colour: #178E7B;
Brightness & contrast
Relative luminance0.20958WCAG 2.x, 0 is black and 1 is white
Perceived brightness117.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.19:1
Contrast with white4.04:1WCAG normal text: Fail
Contrast with black5.19:1WCAG normal text: AA
Greyscale equivalent#737373
Inverted#E87184
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.04:1WCAG large text: AA
Contrast with black, large text5.19:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#8E172A
Analogous#178E3F, #17668E
Triadic#7B178E, #8E7B17
Split complementary#8E1766, #8E3F17
Tetradic#3F178E, #8E172A, #668E17
Tints, shades & saturation
Channel breakdown
R23
G142
B123
Red23 (9%)
Green142 (55.7%)
Blue123 (48.2%)
Hue170.42°
Saturation (HSL)72.12%
Lightness32.35%
Dominant channelGreen
Hex per channelR 17 · G 8E · B 7B
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Nerdulate something else
Nothing in mind? Surprise me · today’s page