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Recognised as Colour

#21A181

  • #21A181
  • Cyan
  • Dark
  • Nearest: Sea green

#21A181 is a cyan with RGB values 33, 161, 129 and HSL 165°, 66%, 38%. It is a dark colour, so black text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Sea green.

Colour values

#21A181#21A181
HEX#21A181
RGBrgb(33, 161, 129)
RGB (0–1)0.1294, 0.6314, 0.5059
RGB percentages12.9%, 63.1%, 50.6%
HSLhsl(165, 66%, 38%)
HSV / HSBhsv(165, 79.5%, 63.1%)
CMYK79.5%, 0%, 19.9%, 36.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,204,033
CSS custom property--colour: #21A181;

Brightness & contrast

Relative luminance0.27398WCAG 2.x, 0 is black and 1 is white
Perceived brightness132.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.48:1
Contrast with white3.24:1WCAG normal text: Fail
Contrast with black6.48:1WCAG normal text: AA
Greyscale equivalent#838383
Inverted#DE5E7E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#9C967Fno red cones; affects about 1% of men; ΔE 39.9 from the original
Deuteranopia#8C8A83no green cones; the most common form, about 1% of men; ΔE 40.8 from the original
Tritanopia#00A298no blue cones; rare, and affects men and women equally; ΔE 12.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.24:1WCAG large text: AA
Contrast with black, large text6.48:1WCAG large text: AAA

Named colours

Sea green · ΔE 15.1Light seagreen · ΔE 15.4Medium aquamarine · ΔE 16.6Medium seagreen · ΔE 19.4Dark cyan · ΔE 20.6Teal · ΔE 22.8
Nearest named CSS colourSea green (#2E8B57)ΔE 15.11, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A12141
Analogous#21A141, #2181A1
Triadic#8121A1, #A18121
Split complementary#A12181, #A14121
Tetradic#4121A1, #A12141, #81A121

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A2ECD9
Lighter +30%#78E3C8
Lighter +20%#4DDBB7
Lighter +10%#2ACBA3
Darker −10%#18775F
Darker −20%#104C3D
Darker −30%#07221B
Darker −40%#000000
More saturated +25%#09B98D
Less saturated −25%#398975

Channel breakdown

R33
G161
B129
Red33 (12.9%)
Green161 (63.1%)
Blue129 (50.6%)
Hue165°
Saturation (HSL)65.98%
Lightness38.04%
Dominant channelGreen
Hex per channelR 21 · G A1 · B 81

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Every value on this page was computed from “21a181” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.