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Recognised as Colour

#21DA9B

  • #21DA9B
  • Cyan
  • Light
  • Nearest: Medium seagreen

#21DA9B is a cyan with RGB values 33, 218, 155 and HSL 160°, 74%, 49%. It is a light colour, so black text on it reaches 11.6:1 contrast (AAA for normal text). The nearest named colour is Medium seagreen.

Colour values

#21DA9B#21DA9B
HEX#21DA9B
RGBrgb(33, 218, 155)
RGB (0–1)0.1294, 0.8549, 0.6078
RGB percentages12.9%, 85.5%, 60.8%
HSLhsl(159.6, 73.7%, 49.2%)
HSV / HSBhsv(159.6, 84.9%, 85.5%)
CMYK84.9%, 0%, 28.9%, 14.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,218,651
CSS custom property--colour: #21DA9B;

Brightness & contrast

Relative luminance0.52833WCAG 2.x, 0 is black and 1 is white
Perceived brightness176 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 11.57:1
Contrast with white1.82:1WCAG normal text: Fail
Contrast with black11.57:1WCAG normal text: AAA
Greyscale equivalent#AEAEAE
Inverted#DE2564

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#D6C997no red cones; affects about 1% of men; ΔE 55.3 from the original
Deuteranopia#C1BA9Fno green cones; the most common form, about 1% of men; ΔE 55.9 from the original
Tritanopia#00DAC9no blue cones; rare, and affects men and women equally; ΔE 25.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.82:1WCAG large text: Fail
Contrast with black, large text11.57:1WCAG large text: AAA

Named colours

Medium seagreen · ΔE 16.6Medium spring green · ΔE 21Aquamarine · ΔE 21Medium aquamarine · ΔE 22.3Light green · ΔE 23Pale green · ΔE 25.3
Nearest named CSS colourMedium seagreen (#3CB371)ΔE 16.6, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DA2160
Analogous#21DA3E, #21BDDA
Triadic#9B21DA, #DA9B21
Split complementary#DA21BD, #DA3E21
Tetradic#3E21DA, #DA2160, #BDDA21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CFF8EA
Lighter +30%#A3F1D6
Lighter +20%#77EAC3
Lighter +10%#4AE4AF
Darker −10%#1AAE7C
Darker −20%#14815C
Darker −30%#0D553D
Darker −40%#06291D
More saturated +25%#02F9A5
Less saturated −25%#40BB91

Channel breakdown

R33
G218
B155
Red33 (12.9%)
Green218 (85.5%)
Blue155 (60.8%)
Hue159.57°
Saturation (HSL)73.71%
Lightness49.22%
Dominant channelGreen
Hex per channelR 21 · G DA · B 9B

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Every value on this page was computed from “21da9b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.