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Recognised as Colour

#21CCDE

  • #21CCDE
  • Cyan
  • Dark
  • Nearest: Dark turquoise

#21CCDE is a cyan with RGB values 33, 204, 222 and HSL 186°, 74%, 50%. It is a dark colour, so black text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#21CCDE#21CCDE
HEX#21CCDE
RGBrgb(33, 204, 222)
RGB (0–1)0.1294, 0.8, 0.8706
RGB percentages12.9%, 80%, 87.1%
HSLhsl(185.7, 74.1%, 50%)
HSV / HSBhsv(185.7, 85.1%, 87.1%)
CMYK85.1%, 8.1%, 0%, 12.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,215,134
CSS custom property--colour: #21CCDE;

Brightness & contrast

Relative luminance0.48783WCAG 2.x, 0 is black and 1 is white
Perceived brightness174.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 10.76:1
Contrast with white1.95:1WCAG normal text: Fail
Contrast with black10.76:1WCAG normal text: AAA
Greyscale equivalent#A9A9A9
Inverted#DE3321

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#BAC4DFno red cones; affects about 1% of men; ΔE 36.6 from the original
Deuteranopia#A1B2DEno green cones; the most common form, about 1% of men; ΔE 38 from the original
Tritanopia#00D5D1no blue cones; rare, and affects men and women equally; ΔE 13.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.95:1WCAG large text: Fail
Contrast with black, large text10.76:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 9.3Medium turquoise · ΔE 12.7Light seagreen · ΔE 17.4Sky blue · ΔE 19.4Turquoise · ΔE 20.3Aqua · ΔE 22.2
Nearest named CSS colourDark turquoise (#00CED1)ΔE 9.31, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DE3321
Analogous#21DE92, #216DDE
Triadic#DE21CC, #CCDE21
Split complementary#DE216D, #DE9221
Tetradic#9221DE, #DE3321, #6DDE21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D3F5F8
Lighter +30%#A6EBF2
Lighter +20%#7AE0EB
Lighter +10%#4DD6E5
Darker −10%#1AA3B2
Darker −20%#147A85
Darker −30%#0D5259
Darker −40%#07292C
More saturated +25%#01E6FE
Less saturated −25%#41B2BE

Channel breakdown

R33
G204
B222
Red33 (12.9%)
Green204 (80%)
Blue222 (87.1%)
Hue185.71°
Saturation (HSL)74.12%
Lightness50%
Dominant channelBlue
Hex per channelR 21 · G CC · B DE

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