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Recognised as Colour

#21DFB4

  • #21DFB4
  • Cyan
  • Light
  • Nearest: Aquamarine

#21DFB4 is a cyan with RGB values 33, 223, 180 and HSL 166°, 75%, 50%. It is a light colour, so black text on it reaches 12.3:1 contrast (AAA for normal text). The nearest named colour is Aquamarine.

Colour values

#21DFB4#21DFB4
HEX#21DFB4
RGBrgb(33, 223, 180)
RGB (0–1)0.1294, 0.8745, 0.7059
RGB percentages12.9%, 87.5%, 70.6%
HSLhsl(166.4, 74.8%, 50.2%)
HSV / HSBhsv(166.4, 85.2%, 87.5%)
CMYK85.2%, 0%, 19.3%, 12.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,219,956
CSS custom property--colour: #21DFB4;

Brightness & contrast

Relative luminance0.56394WCAG 2.x, 0 is black and 1 is white
Perceived brightness182.2 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.28:1
Contrast with white1.71:1WCAG normal text: Fail
Contrast with black12.28:1WCAG normal text: AAA
Greyscale equivalent#B4B4B4
Inverted#DE204B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#D8CFB2no red cones; affects about 1% of men; ΔE 52.8 from the original
Deuteranopia#C2BFB7no green cones; the most common form, about 1% of men; ΔE 53.7 from the original
Tritanopia#00E1D3no blue cones; rare, and affects men and women equally; ΔE 16 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.71:1WCAG large text: Fail
Contrast with black, large text12.28:1WCAG large text: AAA

Named colours

Aquamarine · ΔE 14.8Medium aquamarine · ΔE 16.1Turquoise · ΔE 16.1Medium seagreen · ΔE 22.1Medium turquoise · ΔE 23.9Aqua · ΔE 26.1
Nearest named CSS colourAquamarine (#7FFFD4)ΔE 14.81, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DF214C
Analogous#21DF55, #21ABDF
Triadic#B421DF, #DFB421
Split complementary#DF21AB, #DF5521
Tetradic#5521DF, #DF214C, #ABDF21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D3F9F0
Lighter +30%#A7F2E1
Lighter +20%#7AECD2
Lighter +10%#4EE5C3
Darker −10%#1AB390
Darker −20%#13876D
Darker −30%#0D5A49
Darker −40%#072D25
More saturated +25%#01FFC5
Less saturated −25%#41BFA3

Channel breakdown

R33
G223
B180
Red33 (12.9%)
Green223 (87.5%)
Blue180 (70.6%)
Hue166.42°
Saturation (HSL)74.8%
Lightness50.2%
Dominant channelGreen
Hex per channelR 21 · G DF · B B4

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Every value on this page was computed from “21dfb4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.