Recognised as Colour

#3666DD

#3666DD
Blue
Dark
Nearest: Royal blue

#3666DD is a blue with RGB values 54, 102, 221 and HSL 223°, 71%, 54%. It is a dark colour, so white text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#3666DD#3666DD

HEX#3666DD

RGBrgb(54, 102, 221)

RGB (0–1)0.2118, 0.4, 0.8667

RGB percentages21.2%, 40%, 86.7%

HSLhsl(222.8, 71.1%, 53.9%)

HSV / HSBhsv(222.8, 75.6%, 86.7%)

CMYK75.6%, 53.8%, 0%, 13.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer3,565,277

CSS custom property--colour: #3666DD;

Brightness & contrast

Relative luminance0.15507WCAG 2.x, 0 is black and 1 is white

Perceived brightness112 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.12:1

Contrast with white5.12:1WCAG normal text: AA

Contrast with black4.1:1WCAG normal text: Fail

Greyscale equivalent#646464

Inverted#C99922

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#0076E1no red cones; affects about 1% of men; ΔE 13 from the original

Deuteranopia#0066DBno green cones; the most common form, about 1% of men; ΔE 4.4 from the original

Tritanopia#008398no blue cones; rare, and affects men and women equally; ΔE 66.1 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text5.12:1WCAG large text: AAA

Contrast with black, large text4.1:1WCAG large text: AA

Named colours

Royal blue · ΔE 1.8 Slate blue · ΔE 13.2 Medium slateblue · ΔE 16.8 Dodgerblue · ΔE 20.3 Medium purple · ΔE 21 Cornflower blue · ΔE 27.6

Nearest named CSS colourRoyal blue (#4169E1)ΔE 1.77, below the just-noticeable difference

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#DDAD36

Analogous#36BADD, #5936DD

Triadic#DD3666, #66DD36

Split complementary#DD5936, #BADD36

Tetradic#DD36BA, #DDAD36, #36DD59

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#E4EBFB

Lighter +30%#B9CAF3

Lighter +20%#8DA8EC

Lighter +10%#6287E4

Darker −10%#204EC0

Darker −20%#193C94

Darker −30%#122B68

Darker −40%#0A193D

More saturated +25%#195AFA

Less saturated −25%#5372C0

Channel breakdown

R54

G102

B221

Red54 (21.2%)

Green102 (40%)

Blue221 (86.7%)

Hue222.75°

Saturation (HSL)71.06%

Lightness53.92%

Dominant channelBlue

Hex per channelR 36 · G 66 · B DD

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#3666DD

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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