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Recognised as Colour

#21D9A3

  • #21D9A3
  • Cyan
  • Light
  • Nearest: Medium seagreen

#21D9A3 is a cyan with RGB values 33, 217, 163 and HSL 162°, 74%, 49%. It is a light colour, so black text on it reaches 11.5:1 contrast (AAA for normal text). The nearest named colour is Medium seagreen.

Colour values

#21D9A3#21D9A3
HEX#21D9A3
RGBrgb(33, 217, 163)
RGB (0–1)0.1294, 0.851, 0.6392
RGB percentages12.9%, 85.1%, 63.9%
HSLhsl(162.4, 73.6%, 49%)
HSV / HSBhsv(162.4, 84.8%, 85.1%)
CMYK84.8%, 0%, 24.9%, 14.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,218,403
CSS custom property--colour: #21D9A3;

Brightness & contrast

Relative luminance0.52593WCAG 2.x, 0 is black and 1 is white
Perceived brightness176.1 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 11.52:1
Contrast with white1.82:1WCAG normal text: Fail
Contrast with black11.52:1WCAG normal text: AAA
Greyscale equivalent#AEAEAE
Inverted#DE265C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#D4C9A0no red cones; affects about 1% of men; ΔE 53.6 from the original
Deuteranopia#BFBAA7no green cones; the most common form, about 1% of men; ΔE 54.3 from the original
Tritanopia#00DACAno blue cones; rare, and affects men and women equally; ΔE 21 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.82:1WCAG large text: Fail
Contrast with black, large text11.52:1WCAG large text: AAA

Named colours

Medium seagreen · ΔE 17.4Aquamarine · ΔE 18.2Medium aquamarine · ΔE 18.5Turquoise · ΔE 22.2Medium spring green · ΔE 25.3Light green · ΔE 25.8
Nearest named CSS colourMedium seagreen (#3CB371)ΔE 17.36, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D92157
Analogous#21D947, #21B3D9
Triadic#A321D9, #D9A321
Split complementary#D921B3, #D94721
Tetradic#4721D9, #D92157, #B3D921

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CEF8EC
Lighter +30%#A2F1DA
Lighter +20%#76EAC8
Lighter +10%#4AE3B6
Darker −10%#1AAD82
Darker −20%#148060
Darker −30%#0D543F
Darker −40%#06281E
More saturated +25%#02F8B0
Less saturated −25%#40BA96

Channel breakdown

R33
G217
B163
Red33 (12.9%)
Green217 (85.1%)
Blue163 (63.9%)
Hue162.39°
Saturation (HSL)73.6%
Lightness49.02%
Dominant channelGreen
Hex per channelR 21 · G D9 · B A3

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Every value on this page was computed from “21d9a3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.