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Recognised as Colour

#21474E

  • #21474E
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#21474E is a cyan with RGB values 33, 71, 78 and HSL 189°, 41%, 22%. It is a dark colour, so white text on it reaches 10.1:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#21474E#21474E
HEX#21474E
RGBrgb(33, 71, 78)
RGB (0–1)0.1294, 0.2784, 0.3059
RGB percentages12.9%, 27.8%, 30.6%
HSLhsl(189.3, 40.5%, 21.8%)
HSV / HSBhsv(189.3, 57.7%, 30.6%)
CMYK57.7%, 9%, 0%, 69.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,180,942
CSS custom property--colour: #21474E;

Brightness & contrast

Relative luminance0.0538WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.12:1
Contrast with white10.12:1WCAG normal text: AAA
Contrast with black2.08:1WCAG normal text: Fail
Greyscale equivalent#3F3F3F
Inverted#DEB8B1

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#41454Eno red cones; affects about 1% of men; ΔE 12.1 from the original
Deuteranopia#3A3F4Eno green cones; the most common form, about 1% of men; ΔE 13.1 from the original
Tritanopia#024A49no blue cones; rare, and affects men and women equally; ΔE 9.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.12:1WCAG large text: AAA
Contrast with black, large text2.08:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 5.8Dim grey · ΔE 21.7Slate grey · ΔE 26.7Teal · ΔE 27Gray · ΔE 29.3Light slate grey · ΔE 29.7
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 5.79, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4E2821
Analogous#214E3F, #21304E
Triadic#4E2147, #474E21
Split complementary#4E2130, #4E3F21
Tetradic#3F214E, #4E2821, #304E21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#76B9C5
Lighter +30%#52A6B6
Lighter +20%#3F8896
Lighter +10%#306872
Darker −10%#12262A
Darker −20%#030606
Darker −30%#000000
Darker −40%#000000
More saturated +25%#13515C
Less saturated −25%#2F3D40

Channel breakdown

R33
G71
B78
Red33 (12.9%)
Green71 (27.8%)
Blue78 (30.6%)
Hue189.33°
Saturation (HSL)40.54%
Lightness21.76%
Dominant channelBlue
Hex per channelR 21 · G 47 · B 4E

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Every value on this page was computed from “21474e” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.