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Recognised as Colour

#21DF9F

  • #21DF9F
  • Cyan
  • Light
  • Nearest: Medium seagreen

#21DF9F is a cyan with RGB values 33, 223, 159 and HSL 160°, 75%, 50%. It is a light colour, so black text on it reaches 12.1:1 contrast (AAA for normal text). The nearest named colour is Medium seagreen.

Colour values

#21DF9F#21DF9F
HEX#21DF9F
RGBrgb(33, 223, 159)
RGB (0–1)0.1294, 0.8745, 0.6235
RGB percentages12.9%, 87.5%, 62.4%
HSLhsl(159.8, 74.8%, 50.2%)
HSV / HSBhsv(159.8, 85.2%, 87.5%)
CMYK85.2%, 0%, 28.7%, 12.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,219,935
CSS custom property--colour: #21DF9F;

Brightness & contrast

Relative luminance0.55602WCAG 2.x, 0 is black and 1 is white
Perceived brightness180 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.12:1
Contrast with white1.73:1WCAG normal text: Fail
Contrast with black12.12:1WCAG normal text: AAA
Greyscale equivalent#B2B2B2
Inverted#DE2060

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#DBCE9Bno red cones; affects about 1% of men; ΔE 56.2 from the original
Deuteranopia#C6BEA3no green cones; the most common form, about 1% of men; ΔE 57.3 from the original
Tritanopia#00DFCEno blue cones; rare, and affects men and women equally; ΔE 25.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.73:1WCAG large text: Fail
Contrast with black, large text12.12:1WCAG large text: AAA

Named colours

Medium seagreen · ΔE 18.4Medium spring green · ΔE 19.6Aquamarine · ΔE 20.6Light green · ΔE 22.9Medium aquamarine · ΔE 23.4Pale green · ΔE 24.8
Nearest named CSS colourMedium seagreen (#3CB371)ΔE 18.36, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DF2161
Analogous#21DF40, #21C0DF
Triadic#9F21DF, #DF9F21
Split complementary#DF21C0, #DF4021
Tetradic#4021DF, #DF2161, #C0DF21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D3F9EC
Lighter +30%#A7F2D9
Lighter +20%#7AECC6
Lighter +10%#4EE5B2
Darker −10%#1AB380
Darker −20%#138760
Darker −30%#0D5A40
Darker −40%#072D20
More saturated +25%#01FFA9
Less saturated −25%#41BF95

Channel breakdown

R33
G223
B159
Red33 (12.9%)
Green223 (87.5%)
Blue159 (62.4%)
Hue159.79°
Saturation (HSL)74.8%
Lightness50.2%
Dominant channelGreen
Hex per channelR 21 · G DF · B 9F

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Every value on this page was computed from “21df9f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.