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Colour

#21D9DE

  • #21D9DE
  • Cyan
  • Light
  • Nearest: Dark turquoise

#21D9DE is a cyan with RGB values 33, 217, 222 and HSL 182°, 74%, 50%. It is a light colour, so black text on it reaches 12:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#21D9DE#21D9DE
HEX#21D9DE
RGBrgb(33, 217, 222)
RGB (0–1)0.1294, 0.851, 0.8706
RGB percentages12.9%, 85.1%, 87.1%
HSLhsl(181.6, 74.1%, 50%)
HSV / HSBhsv(181.6, 85.1%, 87.1%)
CMYK85.1%, 2.3%, 0%, 12.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,218,462
CSS custom property--colour: #21D9DE;

Brightness & contrast

Relative luminance0.55223WCAG 2.x, 0 is black and 1 is white
Perceived brightness183.3 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.04:1
Contrast with white1.74:1WCAG normal text: Fail
Contrast with black12.04:1WCAG normal text: AAA
Greyscale equivalent#B2B2B2
Inverted#DE2621

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#C9CEDFno red cones; affects about 1% of men; ΔE 42 from the original
Deuteranopia#B0BCDFno green cones; the most common form, about 1% of men; ΔE 43.4 from the original
Tritanopia#00E1DAno blue cones; rare, and affects men and women equally; ΔE 8.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.74:1WCAG large text: Fail
Contrast with black, large text12.04:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 4Medium turquoise · ΔE 7.2Turquoise · ΔE 11.6Aqua · ΔE 14.5Cyan · ΔE 14.5Light seagreen · ΔE 15.9
Nearest named CSS colourDark turquoise (#00CED1)ΔE 4.05, a close match
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DE2621
Analogous#21DE84, #217BDE
Triadic#DE21D9, #D9DE21
Split complementary#DE217B, #DE8421
Tetradic#8421DE, #DE2621, #7BDE21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D3F7F8
Lighter +30%#A6F0F2
Lighter +20%#7AE8EB
Lighter +10%#4DE1E5
Darker −10%#1AAEB2
Darker −20%#148285
Darker −30%#0D5759
Darker −40%#072B2C
More saturated +25%#01F7FE
Less saturated −25%#41BBBE

Channel breakdown

R33
G217
B222
Red33 (12.9%)
Green217 (85.1%)
Blue222 (87.1%)
Hue181.59°
Saturation (HSL)74.12%
Lightness50%
Dominant channelBlue
Hex per channelR 21 · G D9 · B DE

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Every value on this page was computed from “21d9de” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.