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Recognised as Colour

#3371DD

  • #3371DD
  • Blue
  • Dark
  • Nearest: Royal blue

#3371DD is a blue with RGB values 51, 113, 221 and HSL 218°, 71%, 53%. It is a dark colour, so white text on it reaches 4.6:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#3371DD#3371DD
HEX#3371DD
RGBrgb(51, 113, 221)
RGB (0–1)0.2, 0.4431, 0.8667
RGB percentages20%, 44.3%, 86.7%
HSLhsl(218.1, 71.4%, 53.3%)
HSV / HSBhsv(218.1, 76.9%, 86.7%)
CMYK76.9%, 48.9%, 0%, 13.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,371,485
CSS custom property--colour: #3371DD;

Brightness & contrast

Relative luminance0.17735WCAG 2.x, 0 is black and 1 is white
Perceived brightness117.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.62:1
Contrast with white4.62:1WCAG normal text: AA
Contrast with black4.55:1WCAG normal text: AA
Greyscale equivalent#6C6C6C
Inverted#CC8E22

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#317DE1no red cones; affects about 1% of men; ΔE 7.9 from the original
Deuteranopia#006EDBno green cones; the most common form, about 1% of men; ΔE 3.3 from the original
Tritanopia#008B9Cno blue cones; rare, and affects men and women equally; ΔE 60.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.62:1WCAG large text: AAA
Contrast with black, large text4.55:1WCAG large text: AAA

Named colours

Royal blue · ΔE 9.4Dodgerblue · ΔE 13.3Slate blue · ΔE 18.6Cornflower blue · ΔE 19.3Medium purple · ΔE 22.4Medium slateblue · ΔE 23.6
Nearest named CSS colourRoyal blue (#4169E1)ΔE 9.41, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DD9F33
Analogous#33C6DD, #4A33DD
Triadic#DD3371, #71DD33
Split complementary#DD4A33, #C6DD33
Tetradic#DD33C6, #DD9F33, #33DD4A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E2EBFA
Lighter +30%#B6CCF3
Lighter +20%#8AAEEC
Lighter +10%#5F8FE4
Darker −10%#2059BD
Darker −20%#184592
Darker −30%#113066
Darker −40%#0A1B3A
More saturated +25%#1569FB
Less saturated −25%#5179BF

Channel breakdown

R51
G113
B221
Red51 (20%)
Green113 (44.3%)
Blue221 (86.7%)
Hue218.12°
Saturation (HSL)71.43%
Lightness53.33%
Dominant channelBlue
Hex per channelR 33 · G 71 · B DD

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Every value on this page was computed from “3371dd” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.