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Recognised as Colour

#21D17C

  • #21D17C
  • Cyan
  • Dark
  • Nearest: Medium spring green

#21D17C is a cyan with RGB values 33, 209, 124 and HSL 151°, 73%, 47%. It is a dark colour, so black text on it reaches 10.5:1 contrast (AAA for normal text). The nearest named colour is Medium spring green.

Colour values

#21D17C#21D17C
HEX#21D17C
RGBrgb(33, 209, 124)
RGB (0–1)0.1294, 0.8196, 0.4863
RGB percentages12.9%, 82%, 48.6%
HSLhsl(151, 72.7%, 47.5%)
HSV / HSBhsv(151, 84.2%, 82%)
CMYK84.2%, 0%, 40.7%, 18%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,216,316
CSS custom property--colour: #21D17C;

Brightness & contrast

Relative luminance0.47379WCAG 2.x, 0 is black and 1 is white
Perceived brightness166.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 10.48:1
Contrast with white2:1WCAG normal text: Fail
Contrast with black10.48:1WCAG normal text: AAA
Greyscale equivalent#A5A5A5
Inverted#DE2E83

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#D0BF76no red cones; affects about 1% of men; ΔE 57.4 from the original
Deuteranopia#BDB282no green cones; the most common form, about 1% of men; ΔE 57.6 from the original
Tritanopia#00CFBCno blue cones; rare, and affects men and women equally; ΔE 36.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2:1WCAG large text: Fail
Contrast with black, large text10.48:1WCAG large text: AAA

Named colours

Medium spring green · ΔE 16.3Medium seagreen · ΔE 16.8Light green · ΔE 19.9Pale green · ΔE 22.1Spring green · ΔE 26.9Forest green · ΔE 30
Nearest named CSS colourMedium spring green (#00FA9A)ΔE 16.34, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D12176
Analogous#21D124, #21CED1
Triadic#7C21D1, #D17C21
Split complementary#D121CE, #D12421
Tetradic#2421D1, #D12176, #CED121

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C8F6E0
Lighter +30%#9CEFC7
Lighter +20%#70E8AE
Lighter +10%#44E195
Darker −10%#1AA562
Darker −20%#137948
Darker −30%#0C4D2E
Darker −40%#052113
More saturated +25%#03EF7D
Less saturated −25%#3FB37B

Channel breakdown

R33
G209
B124
Red33 (12.9%)
Green209 (82%)
Blue124 (48.6%)
Hue151.02°
Saturation (HSL)72.73%
Lightness47.45%
Dominant channelGreen
Hex per channelR 21 · G D1 · B 7C

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Every value on this page was computed from “21d17c” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.