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Recognised as Colour

#21DAD3

  • #21DAD3
  • Cyan
  • Light
  • Nearest: Turquoise

#21DAD3 is a cyan with RGB values 33, 218, 211 and HSL 178°, 74%, 49%. It is a light colour, so black text on it reaches 12:1 contrast (AAA for normal text). The nearest named colour is Turquoise.

Colour values

#21DAD3#21DAD3
HEX#21DAD3
RGBrgb(33, 218, 211)
RGB (0–1)0.1294, 0.8549, 0.8275
RGB percentages12.9%, 85.5%, 82.7%
HSLhsl(177.7, 73.7%, 49.2%)
HSV / HSBhsv(177.7, 84.9%, 85.5%)
CMYK84.9%, 0%, 3.2%, 14.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,218,707
CSS custom property--colour: #21DAD3;

Brightness & contrast

Relative luminance0.55169WCAG 2.x, 0 is black and 1 is white
Perceived brightness182.5 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.03:1
Contrast with white1.75:1WCAG normal text: Fail
Contrast with black12.03:1WCAG normal text: AAA
Greyscale equivalent#B2B2B2
Inverted#DE252C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#CCCED3no red cones; affects about 1% of men; ΔE 44.3 from the original
Deuteranopia#B5BDD4no green cones; the most common form, about 1% of men; ΔE 45.6 from the original
Tritanopia#00E0D7no blue cones; rare, and affects men and women equally; ΔE 3.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.75:1WCAG large text: Fail
Contrast with black, large text12.03:1WCAG large text: AAA

Named colours

Turquoise · ΔE 5.3Medium turquoise · ΔE 6.6Dark turquoise · ΔE 7Aqua · ΔE 13.9Cyan · ΔE 13.9Light seagreen · ΔE 14.8
Nearest named CSS colourTurquoise (#40E0D0)ΔE 5.28, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DA2128
Analogous#21DA77, #2184DA
Triadic#D321DA, #DAD321
Split complementary#DA2184, #DA7721
Tetradic#7721DA, #DA2128, #84DA21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CFF8F6
Lighter +30%#A3F1EE
Lighter +20%#77EAE6
Lighter +10%#4AE4DE
Darker −10%#1AAEA8
Darker −20%#14817D
Darker −30%#0D5552
Darker −40%#062928
More saturated +25%#02F9F0
Less saturated −25%#40BBB6

Channel breakdown

R33
G218
B211
Red33 (12.9%)
Green218 (85.5%)
Blue211 (82.7%)
Hue177.73°
Saturation (HSL)73.71%
Lightness49.22%
Dominant channelGreen
Hex per channelR 21 · G DA · B D3

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Every value on this page was computed from “21dad3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.