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Recognised as Colour

#218ACB

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

#218ACB is a blue with RGB values 33, 138, 203 and HSL 203°, 72%, 46%. 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

#218ACB#218ACB
HEX#218ACB
RGBrgb(33, 138, 203)
RGB (0–1)0.1294, 0.5412, 0.7961
RGB percentages12.9%, 54.1%, 79.6%
HSLhsl(202.9, 72%, 46.3%)
HSV / HSBhsv(202.9, 83.7%, 79.6%)
CMYK83.7%, 32%, 0%, 20.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,198,219
CSS custom property--colour: #218ACB;

Brightness & contrast

Relative luminance0.22812WCAG 2.x, 0 is black and 1 is white
Perceived brightness127.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.56:1
Contrast with white3.78:1WCAG normal text: Fail
Contrast with black5.56:1WCAG normal text: AA
Greyscale equivalent#787878
Inverted#DE7534

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6B8CCEno red cones; affects about 1% of men; ΔE 13.3 from the original
Deuteranopia#547DCAno green cones; the most common form, about 1% of men; ΔE 15.1 from the original
Tritanopia#009AA1no blue cones; rare, and affects men and women equally; ΔE 37.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.78:1WCAG large text: AA
Contrast with black, large text5.56:1WCAG large text: AAA

Named colours

Steel blue · ΔE 9.8Cornflower blue · ΔE 18.3Deep skyblue · ΔE 21.4Dodgerblue · ΔE 27.2Light skyblue · ΔE 28.6Light slate grey · ΔE 30.7
Nearest named CSS colourSteel blue (#4682B4)ΔE 9.84, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CB6221
Analogous#21CBB7, #2135CB
Triadic#CB218A, #8ACB21
Split complementary#CB2135, #CBB721
Tetradic#B721CB, #CB6221, #35CB21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C3E2F5
Lighter +30%#97CDEE
Lighter +20%#6BB8E7
Lighter +10%#3FA2E0
Darker −10%#1A6C9F
Darker −20%#134E73
Darker −30%#0C3147
Darker −40%#04131C
More saturated +25%#0491E8
Less saturated −25%#3E83AE

Channel breakdown

R33
G138
B203
Red33 (12.9%)
Green138 (54.1%)
Blue203 (79.6%)
Hue202.94°
Saturation (HSL)72.03%
Lightness46.27%
Dominant channelBlue
Hex per channelR 21 · G 8A · B CB

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