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Colour

#3366D0

  • #3366D0
  • Blue
  • Dark
  • Nearest: Royal blue

#3366D0 is a blue with RGB values 51, 102, 208 and HSL 221°, 63%, 51%. It is a dark colour, so white text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#3366D0#3366D0
HEX#3366D0
RGBrgb(51, 102, 208)
RGB (0–1)0.2, 0.4, 0.8157
RGB percentages20%, 40%, 81.6%
HSLhsl(220.5, 62.5%, 50.8%)
HSV / HSBhsv(220.5, 75.5%, 81.6%)
CMYK75.5%, 51%, 0%, 18.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,368,656
CSS custom property--colour: #3366D0;

Brightness & contrast

Relative luminance0.14761WCAG 2.x, 0 is black and 1 is white
Perceived brightness108.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.31:1
Contrast with white5.31:1WCAG normal text: AA
Contrast with black3.95:1WCAG normal text: Fail
Greyscale equivalent#636363
Inverted#CC992F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2273D4no red cones; affects about 1% of men; ΔE 9.6 from the original
Deuteranopia#0064CEno green cones; the most common form, about 1% of men; ΔE 3.7 from the original
Tritanopia#008091no 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 text5.31:1WCAG large text: AAA
Contrast with black, large text3.95:1WCAG large text: AA

Named colours

Royal blue · ΔE 8.6Slate blue · ΔE 16Dodgerblue · ΔE 17.8Medium purple · ΔE 21.5Cornflower blue · ΔE 22.4Medium slateblue · ΔE 22.7
Nearest named CSS colourRoyal blue (#4169E1)ΔE 8.6, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D09D33
Analogous#33B4D0, #4F33D0
Triadic#D03366, #66D033
Split complementary#D04F33, #B4D033
Tetradic#D033B4, #D09D33, #33D04F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D9E2F6
Lighter +30%#AFC3ED
Lighter +20%#86A4E3
Lighter +10%#5C85DA
Darker −10%#2751A9
Darker −20%#1D3D80
Darker −30%#142956
Darker −40%#0A152D
More saturated +25%#145BEF
Less saturated −25%#5271B1

Channel breakdown

R51
G102
B208
Red51 (20%)
Green102 (40%)
Blue208 (81.6%)
Hue220.51°
Saturation (HSL)62.55%
Lightness50.78%
Dominant channelBlue
Hex per channelR 33 · G 66 · B D0

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Every value on this page was computed from “3366d0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.