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Recognised as Colour

#663BA3

  • #663BA3
  • Violet
  • Dark
  • Nearest: Rebecca purple

#663BA3 is a violet with RGB values 102, 59, 163 and HSL 265°, 47%, 44%. It is a dark colour, so white text on it reaches 7.7:1 contrast (AAA for normal text). The nearest named colour is Rebecca purple.

Colour values

#663BA3#663BA3
HEX#663BA3
RGBrgb(102, 59, 163)
RGB (0–1)0.4, 0.2314, 0.6392
RGB percentages40%, 23.1%, 63.9%
HSLhsl(264.8, 46.8%, 43.5%)
HSV / HSBhsv(264.8, 63.8%, 63.9%)
CMYK37.4%, 63.8%, 0%, 36.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,699,939
CSS custom property--colour: #663BA3;

Brightness & contrast

Relative luminance0.08597WCAG 2.x, 0 is black and 1 is white
Perceived brightness90.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.72:1
Contrast with white7.72:1WCAG normal text: AAA
Contrast with black2.72:1WCAG normal text: Fail
Greyscale equivalent#4C4C4C
Inverted#99C45C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0053A6no red cones; affects about 1% of men; ΔE 28.9 from the original
Deuteranopia#0A52A1no green cones; the most common form, about 1% of men; ΔE 29.9 from the original
Tritanopia#585269no blue cones; rare, and affects men and women equally; ΔE 50 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.72:1WCAG large text: AAA
Contrast with black, large text2.72:1WCAG large text: Fail

Named colours

Rebecca purple · ΔE 3.7Slate blue · ΔE 14.1Dark slateblue · ΔE 17.4Indigo · ΔE 18.5Medium purple · ΔE 20.3Midnight blue · ΔE 21.5
Nearest named CSS colourRebecca purple (#663399)ΔE 3.69, a close match
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#78A33B
Analogous#3B44A3, #9A3BA3
Triadic#A3663B, #3BA366
Split complementary#A39A3B, #44A33B
Tetradic#A33B44, #78A33B, #3BA39A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D2C1E9
Lighter +30%#B69CDB
Lighter +20%#9A76CE
Lighter +10%#7F51C0
Darker −10%#4F2D7E
Darker −20%#372058
Darker −30%#201233
Darker −40%#08050D
More saturated +25%#611FBF
Less saturated −25%#6B5787

Channel breakdown

R102
G59
B163
Red102 (40%)
Green59 (23.1%)
Blue163 (63.9%)
Hue264.81°
Saturation (HSL)46.85%
Lightness43.53%
Dominant channelBlue
Hex per channelR 66 · G 3B · B A3

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Every value on this page was computed from “663ba3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.