Recognised as Colour
#51A4AB
- #51A4AB
- Cyan
- Dark
- Nearest: Cadetblue
#51A4AB is a cyan with RGB values 81, 164, 171 and HSL 185°, 36%, 49%. It is a dark colour, so black text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Cadetblue.
Colour values
#51A4AB#51A4AB
HEX#51A4AB
RGBrgb(81, 164, 171)
RGB (0–1)0.3176, 0.6431, 0.6706
RGB percentages31.8%, 64.3%, 67.1%
HSLhsl(184.7, 35.7%, 49.4%)
HSV / HSBhsv(184.7, 52.6%, 67.1%)
CMYK52.6%, 4.1%, 0%, 32.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,350,571
CSS custom property--colour: #51A4AB;
Brightness & contrast
Relative luminance0.31241WCAG 2.x, 0 is black and 1 is white
Perceived brightness145.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.25:1
Contrast with white2.9:1WCAG normal text: Fail
Contrast with black7.25:1WCAG normal text: AAA
Greyscale equivalent#939393
Inverted#AE5B54
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.9:1WCAG large text: Fail
Contrast with black, large text7.25:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#AB5851
Analogous#51AB85, #5177AB
Triadic#AB51A4, #A4AB51
Split complementary#AB5177, #AB8551
Tetradic#8551AB, #AB5851, #77AB51
Tints, shades & saturation
Channel breakdown
R81
G164
B171
Red81 (31.8%)
Green164 (64.3%)
Blue171 (67.1%)
Hue184.67°
Saturation (HSL)35.71%
Lightness49.41%
Dominant channelBlue
Hex per channelR 51 · G A4 · B AB
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