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Colour

#21DDDD

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

#21DDDD is a cyan with RGB values 33, 221, 221 and HSL 180°, 74%, 50%. It is a light colour, so black text on it reaches 12.5:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#21DDDD#21DDDD
HEX#21DDDD
RGBrgb(33, 221, 221)
RGB (0–1)0.1294, 0.8667, 0.8667
RGB percentages12.9%, 86.7%, 86.7%
HSLhsl(180, 74%, 49.8%)
HSV / HSBhsv(180, 85.1%, 86.7%)
CMYK85.1%, 0%, 0%, 13.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,219,485
CSS custom property--colour: #21DDDD;

Brightness & contrast

Relative luminance0.57257WCAG 2.x, 0 is black and 1 is white
Perceived brightness185.9 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.45:1
Contrast with white1.69:1WCAG normal text: Fail
Contrast with black12.45:1WCAG normal text: AAA
Greyscale equivalent#B5B5B5
Inverted#DE2222

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#CED2DDno red cones; affects about 1% of men; ΔE 43.3 from the original
Deuteranopia#B5C0DEno green cones; the most common form, about 1% of men; ΔE 44.6 from the original
Tritanopia#00E4DDno blue cones; rare, and affects men and women equally; ΔE 5.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.69:1WCAG large text: Fail
Contrast with black, large text12.45:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 5.5Medium turquoise · ΔE 7Turquoise · ΔE 8.7Aqua · ΔE 12.5Cyan · ΔE 12.5Light seagreen · ΔE 16.4
Nearest named CSS colourDark turquoise (#00CED1)ΔE 5.5, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DD2121
Analogous#21DD7F, #217FDD
Triadic#DD21DD, #DDDD21
Split complementary#DD217F, #DD7F21
Tetradic#7F21DD, #DD2121, #7FDD21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D2F8F8
Lighter +30%#A5F2F2
Lighter +20%#79EBEB
Lighter +10%#4DE4E4
Darker −10%#1AB1B1
Darker −20%#148484
Darker −30%#0D5858
Darker −40%#062C2C
More saturated +25%#01FDFD
Less saturated −25%#41BDBD

Channel breakdown

R33
G221
B221
Red33 (12.9%)
Green221 (86.7%)
Blue221 (86.7%)
Hue180°
Saturation (HSL)74.02%
Lightness49.8%
Dominant channelGreen and Blue
Hex per channelR 21 · G DD · B DD

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