Recognised as Colour
#51ADBB
- #51ADBB
- Cyan
- Dark
- Nearest: Cadetblue
#51ADBB is a cyan with RGB values 81, 173, 187 and HSL 188°, 44%, 53%. It is a dark colour, so black text on it reaches 8:1 contrast (AAA for normal text). The nearest named colour is Cadetblue.
Colour values
#51ADBB#51ADBB
HEX#51ADBB
RGBrgb(81, 173, 187)
RGB (0–1)0.3176, 0.6784, 0.7333
RGB percentages31.8%, 67.8%, 73.3%
HSLhsl(187.9, 43.8%, 52.5%)
HSV / HSBhsv(187.9, 56.7%, 73.3%)
CMYK56.7%, 7.5%, 0%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,352,891
CSS custom property--colour: #51ADBB;
Brightness & contrast
Relative luminance0.35224WCAG 2.x, 0 is black and 1 is white
Perceived brightness153.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.04:1
Contrast with white2.61:1WCAG normal text: Fail
Contrast with black8.04:1WCAG normal text: AAA
Greyscale equivalent#9A9A9A
Inverted#AE5244
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.61:1WCAG large text: Fail
Contrast with black, large text8.04:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#BB5F51
Analogous#51BB94, #5178BB
Triadic#BB51AD, #ADBB51
Split complementary#BB5178, #BB9451
Tetradic#9451BB, #BB5F51, #78BB51
Tints, shades & saturation
Channel breakdown
R81
G173
B187
Red81 (31.8%)
Green173 (67.8%)
Blue187 (73.3%)
Hue187.92°
Saturation (HSL)43.8%
Lightness52.55%
Dominant channelBlue
Hex per channelR 51 · G AD · B BB
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