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Recognised as Colour

#377AA4

  • #377AA4
  • Blue
  • Dark
  • Nearest: Steel blue

#377AA4 is a blue with RGB values 55, 122, 164 and HSL 203°, 50%, 43%. It is a dark colour, so white text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#377AA4#377AA4
HEX#377AA4
RGBrgb(55, 122, 164)
RGB (0–1)0.2157, 0.4784, 0.6431
RGB percentages21.6%, 47.8%, 64.3%
HSLhsl(203.1, 49.8%, 42.9%)
HSV / HSBhsv(203.1, 66.5%, 64.3%)
CMYK66.5%, 25.6%, 0%, 35.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,635,876
CSS custom property--colour: #377AA4;

Brightness & contrast

Relative luminance0.17412WCAG 2.x, 0 is black and 1 is white
Perceived brightness112.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.69:1
Contrast with white4.69:1WCAG normal text: AA
Contrast with black4.48:1WCAG normal text: Fail
Greyscale equivalent#6F6F6F
Inverted#C8855B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#677AA6no red cones; affects about 1% of men; ΔE 12.6 from the original
Deuteranopia#586FA3no green cones; the most common form, about 1% of men; ΔE 13.8 from the original
Tritanopia#008588no blue cones; rare, and affects men and women equally; ΔE 28 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.69:1WCAG large text: AAA
Contrast with black, large text4.48:1WCAG large text: AA

Named colours

Steel blue · ΔE 6.2Slate grey · ΔE 19.4Light slate grey · ΔE 19.8Cadetblue · ΔE 27.4Deep skyblue · ΔE 29.3Teal · ΔE 29.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 6.17, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A46137
Analogous#37A497, #3744A4
Triadic#A4377A, #7AA437
Split complementary#A43744, #A49737
Tetradic#9837A4, #A46137, #44A437

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BED8E9
Lighter +30%#98C2DC
Lighter +20%#71ABD0
Lighter +10%#4B95C3
Darker −10%#2A5E7E
Darker −20%#1D4158
Darker −30%#112531
Darker −40%#04080B
More saturated +25%#1C80BF
Less saturated −25%#527489

Channel breakdown

R55
G122
B164
Red55 (21.6%)
Green122 (47.8%)
Blue164 (64.3%)
Hue203.12°
Saturation (HSL)49.77%
Lightness42.94%
Dominant channelBlue
Hex per channelR 37 · G 7A · B A4

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Every value on this page was computed from “377aa4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.