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Colour

#001821

  • #001821
  • Cyan
  • Dark
  • Nearest: Black

#001821 is a cyan with RGB values 0, 24, 33 and HSL 196°, 100%, 6%. It is a dark colour, so white text on it reaches 18.2:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#001821#001821
HEX#001821
RGBrgb(0, 24, 33)
RGB (0–1)0, 0.0941, 0.1294
RGB percentages0%, 9.4%, 12.9%
HSLhsl(196.4, 100%, 6.5%)
HSV / HSBhsv(196.4, 100%, 12.9%)
CMYK100%, 27.3%, 0%, 87.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,177
CSS custom property--colour: #001821;

Brightness & contrast

Relative luminance0.00763WCAG 2.x, 0 is black and 1 is white
Perceived brightness21.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 18.22:1
Contrast with white18.22:1WCAG normal text: AAA
Contrast with black1.15:1WCAG normal text: Fail
Greyscale equivalent#141414
Inverted#FFE7DE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#131721no red cones; affects about 1% of men; ΔE 6.6 from the original
Deuteranopia#0E1421no green cones; the most common form, about 1% of men; ΔE 6.7 from the original
Tritanopia#001B1Bno blue cones; rare, and affects men and women equally; ΔE 7.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text18.22:1WCAG large text: AAA
Contrast with black, large text1.15:1WCAG large text: Fail

Named colours

Black · ΔE 12.5Dark slate grey · ΔE 25.8Dim grey · ΔE 38.9Slate grey · ΔE 46.1Teal · ΔE 47.7Gray · ΔE 47.8
Nearest named CSS colourBlack (#000000)ΔE 12.46, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#210900
Analogous#00211A, #000721
Triadic#210018, #182100
Split complementary#210008, #211A00
Tetradic#190021, #210900, #072100

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#00ACED
Lighter +30%#0087BA
Lighter +20%#006287
Lighter +10%#003D54
Darker −10%#000000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#001821
Less saturated −25%#04161D

Channel breakdown

R0
G24
B33
Red0 (0%)
Green24 (9.4%)
Blue33 (12.9%)
Hue196.36°
Saturation (HSL)100%
Lightness6.47%
Dominant channelBlue
Hex per channelR 00 · G 18 · B 21

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Every value on this page was computed from “hex 001821” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.