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Recognised as Colour

#374C81

  • #374C81
  • Blue
  • Dark
  • Nearest: Dark slateblue

#374C81 is a blue with RGB values 55, 76, 129 and HSL 223°, 40%, 36%. It is a dark colour, so white text on it reaches 8.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#374C81#374C81
HEX#374C81
RGBrgb(55, 76, 129)
RGB (0–1)0.2157, 0.298, 0.5059
RGB percentages21.6%, 29.8%, 50.6%
HSLhsl(223, 40.2%, 36.1%)
HSV / HSBhsv(223, 57.4%, 50.6%)
CMYK57.4%, 41.1%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,624,065
CSS custom property--colour: #374C81;

Brightness & contrast

Relative luminance0.07566WCAG 2.x, 0 is black and 1 is white
Perceived brightness78.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.36:1
Contrast with white8.36:1WCAG normal text: AAA
Contrast with black2.51:1WCAG normal text: Fail
Greyscale equivalent#4B4B4B
Inverted#C8B37E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#365183no red cones; affects about 1% of men; ΔE 3.4 from the original
Deuteranopia#2D4B80no green cones; the most common form, about 1% of men; ΔE 2.3 from the original
Tritanopia#0A5860no blue cones; rare, and affects men and women equally; ΔE 34.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.36:1WCAG large text: AAA
Contrast with black, large text2.51:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.9Steel blue · ΔE 23.3Slate grey · ΔE 31.4Light slate grey · ΔE 33.1Midnight blue · ΔE 33.4Cornflower blue · ΔE 33.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.94, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#816C37
Analogous#377181, #473781
Triadic#81374C, #4C8137
Split complementary#814737, #718137
Tetradic#813771, #816C37, #378147

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A9B7DB
Lighter +30%#8699CB
Lighter +20%#627CBC
Lighter +10%#4661A5
Darker −10%#28375D
Darker −20%#192239
Darker −30%#090D16
Darker −40%#000000
More saturated +25%#204298
Less saturated −25%#4E566A

Channel breakdown

R55
G76
B129
Red55 (21.6%)
Green76 (29.8%)
Blue129 (50.6%)
Hue222.97°
Saturation (HSL)40.22%
Lightness36.08%
Dominant channelBlue
Hex per channelR 37 · G 4C · B 81

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Every value on this page was computed from “374c81” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.