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Recognised as Colour

#2183D0

  • #2183D0
  • Blue
  • Dark
  • Nearest: Cornflower blue

#2183D0 is a blue with RGB values 33, 131, 208 and HSL 206°, 73%, 47%. It is a dark colour, so black text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#2183D0#2183D0
HEX#2183D0
RGBrgb(33, 131, 208)
RGB (0–1)0.1294, 0.5137, 0.8157
RGB percentages12.9%, 51.4%, 81.6%
HSLhsl(206.4, 72.6%, 47.3%)
HSV / HSBhsv(206.4, 84.1%, 81.6%)
CMYK84.1%, 37%, 0%, 18.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,196,432
CSS custom property--colour: #2183D0;

Brightness & contrast

Relative luminance0.2111WCAG 2.x, 0 is black and 1 is white
Perceived brightness123.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.22:1
Contrast with white4.02:1WCAG normal text: Fail
Contrast with black5.22:1WCAG normal text: AA
Greyscale equivalent#747474
Inverted#DE7C2F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#5E87D3no red cones; affects about 1% of men; ΔE 9.3 from the original
Deuteranopia#4478CFno green cones; the most common form, about 1% of men; ΔE 11.2 from the original
Tritanopia#00969Fno blue cones; rare, and affects men and women equally; ΔE 44.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.02:1WCAG large text: AA
Contrast with black, large text5.22:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 12.8Steel blue · ΔE 15.7Dodgerblue · ΔE 19.8Deep skyblue · ΔE 26.9Royal blue · ΔE 32Dark slateblue · ΔE 34.4
Nearest named CSS colourCornflower blue (#6495ED)ΔE 12.81, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D06E21
Analogous#21D0C5, #212CD0
Triadic#D02183, #83D021
Split complementary#D0212C, #D0C521
Tetradic#C521D0, #D06E21, #2CD021

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C7E1F6
Lighter +30%#9BCAEF
Lighter +20%#6FB3E8
Lighter +10%#439BE1
Darker −10%#1A67A4
Darker −20%#134C78
Darker −30%#0C304C
Darker −40%#051420
More saturated +25%#0387EE
Less saturated −25%#3F7FB2

Channel breakdown

R33
G131
B208
Red33 (12.9%)
Green131 (51.4%)
Blue208 (81.6%)
Hue206.4°
Saturation (HSL)72.61%
Lightness47.25%
Dominant channelBlue
Hex per channelR 21 · G 83 · B D0

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Every value on this page was computed from “2183d0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.