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Recognised as Colour

#21AE99

  • #21AE99
  • Cyan
  • Dark
  • Nearest: Light seagreen

#21AE99 is a cyan with RGB values 33, 174, 153 and HSL 171°, 68%, 41%. It is a dark colour, so black text on it reaches 7.6:1 contrast (AAA for normal text). The nearest named colour is Light seagreen.

Colour values

#21AE99#21AE99
HEX#21AE99
RGBrgb(33, 174, 153)
RGB (0–1)0.1294, 0.6824, 0.6
RGB percentages12.9%, 68.2%, 60%
HSLhsl(171.1, 68.1%, 40.6%)
HSV / HSBhsv(171.1, 81%, 68.2%)
CMYK81%, 0%, 12.1%, 31.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,207,385
CSS custom property--colour: #21AE99;

Brightness & contrast

Relative luminance0.32895WCAG 2.x, 0 is black and 1 is white
Perceived brightness144.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.58:1
Contrast with white2.77:1WCAG normal text: Fail
Contrast with black7.58:1WCAG normal text: AAA
Greyscale equivalent#8F8F8F
Inverted#DE5166

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A6A398no red cones; affects about 1% of men; ΔE 40 from the original
Deuteranopia#94969Bno green cones; the most common form, about 1% of men; ΔE 40.9 from the original
Tritanopia#00B1A8no blue cones; rare, and affects men and women equally; ΔE 6.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.77:1WCAG large text: Fail
Contrast with black, large text7.58:1WCAG large text: AAA

Named colours

Light seagreen · ΔE 7.7Medium aquamarine · ΔE 14.1Medium turquoise · ΔE 15.9Dark turquoise · ΔE 18Dark cyan · ΔE 18.2Turquoise · ΔE 18.2
Nearest named CSS colourLight seagreen (#20B2AA)ΔE 7.72, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AE2136
Analogous#21AE52, #217DAE
Triadic#9921AE, #AE9921
Split complementary#AE217D, #AE5221
Tetradic#5221AE, #AE2136, #7DAE21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#ACEFE5
Lighter +30%#81E7D8
Lighter +20%#56DFCB
Lighter +10%#2BD7BD
Darker −10%#198373
Darker −20%#11584E
Darker −30%#092D28
Darker −40%#000302
More saturated +25%#07C8AB
Less saturated −25%#3B9487

Channel breakdown

R33
G174
B153
Red33 (12.9%)
Green174 (68.2%)
Blue153 (60%)
Hue171.06°
Saturation (HSL)68.12%
Lightness40.59%
Dominant channelGreen
Hex per channelR 21 · G AE · B 99

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Every value on this page was computed from “21ae99” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.