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Recognised as Colour

#3666A9

  • #3666A9
  • Blue
  • Dark
  • Nearest: Steel blue

#3666A9 is a blue with RGB values 54, 102, 169 and HSL 215°, 52%, 44%. It is a dark colour, so white text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#3666A9#3666A9
HEX#3666A9
RGBrgb(54, 102, 169)
RGB (0–1)0.2118, 0.4, 0.6627
RGB percentages21.2%, 40%, 66.3%
HSLhsl(215, 51.6%, 43.7%)
HSV / HSBhsv(215, 68%, 66.3%)
CMYK68%, 39.6%, 0%, 33.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,565,225
CSS custom property--colour: #3666A9;

Brightness & contrast

Relative luminance0.13152WCAG 2.x, 0 is black and 1 is white
Perceived brightness101.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.78:1
Contrast with white5.78:1WCAG normal text: AA
Contrast with black3.63:1WCAG normal text: Fail
Greyscale equivalent#616161
Inverted#C99956

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#486BACno red cones; affects about 1% of men; ΔE 3.6 from the original
Deuteranopia#3661A8no green cones; the most common form, about 1% of men; ΔE 3.7 from the original
Tritanopia#00757Fno blue cones; rare, and affects men and women equally; ΔE 40.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text5.78:1WCAG large text: AAA
Contrast with black, large text3.63:1WCAG large text: AA

Named colours

Steel blue · ΔE 16.4Cornflower blue · ΔE 21Dark slateblue · ΔE 23.3Dodgerblue · ΔE 28.2Royal blue · ΔE 32.1Slate grey · ΔE 32.8
Nearest named CSS colourSteel blue (#4682B4)ΔE 16.38, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A97936
Analogous#36A0A9, #3F36A9
Triadic#A93666, #66A936
Split complementary#A93F36, #A0A936
Tetradic#A936A0, #A97936, #36A93F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C0D2EB
Lighter +30%#99B6DF
Lighter +20%#739BD2
Lighter +10%#4C7FC6
Darker −10%#2A4F82
Darker −20%#1D375C
Darker −30%#112035
Darker −40%#05090E
More saturated +25%#1A61C5
Less saturated −25%#526B8D

Channel breakdown

R54
G102
B169
Red54 (21.2%)
Green102 (40%)
Blue169 (66.3%)
Hue214.96°
Saturation (HSL)51.57%
Lightness43.73%
Dominant channelBlue
Hex per channelR 36 · G 66 · B A9

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Every value on this page was computed from “3666a9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.