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Colour

#21A7B1

  • #21A7B1
  • Cyan
  • Dark
  • Nearest: Light seagreen

#21A7B1 is a cyan with RGB values 33, 167, 177 and HSL 184°, 69%, 41%. It is a dark colour, so black text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Light seagreen.

Colour values

#21A7B1#21A7B1
HEX#21A7B1
RGBrgb(33, 167, 177)
RGB (0–1)0.1294, 0.6549, 0.6941
RGB percentages12.9%, 65.5%, 69.4%
HSLhsl(184.2, 68.6%, 41.2%)
HSV / HSBhsv(184.2, 81.4%, 69.4%)
CMYK81.4%, 5.6%, 0%, 30.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,205,617
CSS custom property--colour: #21A7B1;

Brightness & contrast

Relative luminance0.31135WCAG 2.x, 0 is black and 1 is white
Perceived brightness142.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.23:1
Contrast with white2.91:1WCAG normal text: Fail
Contrast with black7.23:1WCAG normal text: AAA
Greyscale equivalent#8B8B8B
Inverted#DE584E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#99A0B2no red cones; affects about 1% of men; ΔE 31.9 from the original
Deuteranopia#8691B1no green cones; the most common form, about 1% of men; ΔE 33.6 from the original
Tritanopia#00AEAAno blue cones; rare, and affects men and women equally; ΔE 9.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.91:1WCAG large text: Fail
Contrast with black, large text7.23:1WCAG large text: AAA

Named colours

Light seagreen · ΔE 11.8Dark cyan · ΔE 12Cadetblue · ΔE 13Teal · ΔE 15.8Dark turquoise · ΔE 16.2Medium turquoise · ΔE 17.3
Nearest named CSS colourLight seagreen (#20B2AA)ΔE 11.8, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B12B21
Analogous#21B173, #215FB1
Triadic#B121A7, #A7B121
Split complementary#B1215F, #B17321
Tetradic#7321B1, #B12B21, #5FB121

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#AEEBF0
Lighter +30%#83E1E8
Lighter +20%#58D6E0
Lighter +10%#2DCCD8
Darker −10%#197E86
Darker −20%#11565B
Darker −30%#092D30
Darker −40%#010505
More saturated +25%#07BECB
Less saturated −25%#3B9097

Channel breakdown

R33
G167
B177
Red33 (12.9%)
Green167 (65.5%)
Blue177 (69.4%)
Hue184.17°
Saturation (HSL)68.57%
Lightness41.18%
Dominant channelBlue
Hex per channelR 21 · G A7 · B B1

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Every value on this page was computed from “21a7b1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.