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Recognised as Colour

#21A667

  • #21A667
  • Cyan
  • Dark
  • Nearest: Medium seagreen

#21A667 is a cyan with RGB values 33, 166, 103 and HSL 152°, 67%, 39%. It is a dark colour, so black text on it reaches 6.7:1 contrast (AA for normal text). The nearest named colour is Medium seagreen.

Colour values

#21A667#21A667
HEX#21A667
RGBrgb(33, 166, 103)
RGB (0–1)0.1294, 0.651, 0.4039
RGB percentages12.9%, 65.1%, 40.4%
HSLhsl(151.6, 66.8%, 39%)
HSV / HSBhsv(151.6, 80.1%, 65.1%)
CMYK80.1%, 0%, 38%, 34.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,205,287
CSS custom property--colour: #21A667;

Brightness & contrast

Relative luminance0.28575WCAG 2.x, 0 is black and 1 is white
Perceived brightness133.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.72:1
Contrast with white3.13:1WCAG normal text: Fail
Contrast with black6.72:1WCAG normal text: AA
Greyscale equivalent#858585
Inverted#DE5998

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A59863no red cones; affects about 1% of men; ΔE 46.7 from the original
Deuteranopia#968D6Bno green cones; the most common form, about 1% of men; ΔE 47.2 from the original
Tritanopia#00A596no blue cones; rare, and affects men and women equally; ΔE 27.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.13:1WCAG large text: AA
Contrast with black, large text6.72:1WCAG large text: AAA

Named colours

Medium seagreen · ΔE 5.1Sea green · ΔE 13.3Medium aquamarine · ΔE 23.9Forest green · ΔE 24Dark seagreen · ΔE 28.4Light green · ΔE 29.7
Nearest named CSS colourMedium seagreen (#3CB371)ΔE 5.12, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A62160
Analogous#21A624, #21A3A6
Triadic#6721A6, #A66721
Split complementary#A621A3, #A62421
Tetradic#2421A6, #A62160, #A3A621

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A6EDCB
Lighter +30%#7BE5B3
Lighter +20%#51DC9A
Lighter +10%#29D181
Darker −10%#197B4D
Darker −20%#105132
Darker −30%#082618
Darker −40%#000000
More saturated +25%#08BF68
Less saturated −25%#3A8D66

Channel breakdown

R33
G166
B103
Red33 (12.9%)
Green166 (65.1%)
Blue103 (40.4%)
Hue151.58°
Saturation (HSL)66.83%
Lightness39.02%
Dominant channelGreen
Hex per channelR 21 · G A6 · B 67

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Every value on this page was computed from “21a667” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.