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Recognised as Colour

#218AD1

  • #218AD1
  • Blue
  • Dark
  • Nearest: Steel blue

#218AD1 is a blue with RGB values 33, 138, 209 and HSL 204°, 73%, 47%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#218AD1#218AD1
HEX#218AD1
RGBrgb(33, 138, 209)
RGB (0–1)0.1294, 0.5412, 0.8196
RGB percentages12.9%, 54.1%, 82%
HSLhsl(204.2, 72.7%, 47.5%)
HSV / HSBhsv(204.2, 84.2%, 82%)
CMYK84.2%, 34%, 0%, 18%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,198,225
CSS custom property--colour: #218AD1;

Brightness & contrast

Relative luminance0.23104WCAG 2.x, 0 is black and 1 is white
Perceived brightness128.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.62:1
Contrast with white3.74:1WCAG normal text: Fail
Contrast with black5.62:1WCAG normal text: AA
Greyscale equivalent#797979
Inverted#DE752E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#688DD4no red cones; affects about 1% of men; ΔE 11.8 from the original
Deuteranopia#4F7DD0no green cones; the most common form, about 1% of men; ΔE 14.1 from the original
Tritanopia#009BA4no blue cones; rare, and affects men and women equally; ΔE 40.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.74:1WCAG large text: AA
Contrast with black, large text5.62:1WCAG large text: AAA

Named colours

Steel blue · ΔE 12.6Cornflower blue · ΔE 15.2Deep skyblue · ΔE 22.5Dodgerblue · ΔE 23.5Light skyblue · ΔE 30.2Light slate grey · ΔE 33.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 12.63, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D16821
Analogous#21D1C0, #2132D1
Triadic#D1218A, #8AD121
Split complementary#D12132, #D1C021
Tetradic#C021D1, #D16821, #32D121

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C8E3F6
Lighter +30%#9CCEEF
Lighter +20%#70B8E8
Lighter +10%#44A2E1
Darker −10%#1A6DA5
Darker −20%#135079
Darker −30%#0C334D
Darker −40%#051621
More saturated +25%#0390EF
Less saturated −25%#3F84B3

Channel breakdown

R33
G138
B209
Red33 (12.9%)
Green138 (54.1%)
Blue209 (82%)
Hue204.2°
Saturation (HSL)72.73%
Lightness47.45%
Dominant channelBlue
Hex per channelR 21 · G 8A · B D1

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Every value on this page was computed from “218ad1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.