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Recognised as Colour

#3791FF

  • #3791FF
  • Blue
  • Dark
  • Nearest: Dodgerblue

#3791FF is a blue with RGB values 55, 145, 255 and HSL 213°, 100%, 61%. It is a dark colour, so black text on it reaches 6.7:1 contrast (AA for normal text). The nearest named colour is Dodgerblue.

Colour values

#3791FF#3791FF
HEX#3791FF
RGBrgb(55, 145, 255)
RGB (0–1)0.2157, 0.5686, 1
RGB percentages21.6%, 56.9%, 100%
HSLhsl(213, 100%, 60.8%)
HSV / HSBhsv(213, 78.4%, 100%)
CMYK78.4%, 43.1%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,641,855
CSS custom property--colour: #3791FF;

Brightness & contrast

Relative luminance0.28283WCAG 2.x, 0 is black and 1 is white
Perceived brightness143.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.66:1
Contrast with white3.15:1WCAG normal text: Fail
Contrast with black6.66:1WCAG normal text: AA
Greyscale equivalent#868686
Inverted#C86E00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#599BFFno red cones; affects about 1% of men; ΔE 7.5 from the original
Deuteranopia#3089FDno green cones; the most common form, about 1% of men; ΔE 5.1 from the original
Tritanopia#00ABBBno blue cones; rare, and affects men and women equally; ΔE 60.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.15:1WCAG large text: AA
Contrast with black, large text6.66:1WCAG large text: AAA

Named colours

Dodgerblue · ΔE 2Cornflower blue · ΔE 13.1Royal blue · ΔE 19.6Medium purple · ΔE 28.7Slate blue · ΔE 29.2Medium slateblue · ΔE 31
Nearest named CSS colourDodgerblue (#1E90FF)ΔE 1.97, below the just-noticeable difference
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFA537
Analogous#37F5FF, #4137FF
Triadic#FF3791, #91FF37
Split complementary#FF4137, #F5FF37
Tetradic#FF37F5, #FFA537, #37FF41

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#D0E5FF
Lighter +20%#9DC9FF
Lighter +10%#6AADFF
Darker −10%#0475FF
Darker −20%#005ED0
Darker −30%#00479D
Darker −40%#00306A
More saturated +25%#3791FF
Less saturated −25%#5094E6

Channel breakdown

R55
G145
B255
Red55 (21.6%)
Green145 (56.9%)
Blue255 (100%)
Hue213°
Saturation (HSL)100%
Lightness60.78%
Dominant channelBlue
Hex per channelR 37 · G 91 · B FF

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Every value on this page was computed from “3791ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.