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Recognised as Colour

#663AC7

  • #663AC7
  • Violet
  • Dark
  • Nearest: Dark orchid

#663AC7 is a violet with RGB values 102, 58, 199 and HSL 259°, 56%, 50%. It is a dark colour, so white text on it reaches 7:1 contrast (AAA for normal text). The nearest named colour is Dark orchid.

Colour values

#663AC7#663AC7
HEX#663AC7
RGBrgb(102, 58, 199)
RGB (0–1)0.4, 0.2275, 0.7804
RGB percentages40%, 22.7%, 78%
HSLhsl(258.7, 55.7%, 50.4%)
HSV / HSBhsv(258.7, 70.9%, 78%)
CMYK48.7%, 70.9%, 0%, 22%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,699,719
CSS custom property--colour: #663AC7;

Brightness & contrast

Relative luminance0.09974WCAG 2.x, 0 is black and 1 is white
Perceived brightness98 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.01:1
Contrast with white7.01:1WCAG normal text: AAA
Contrast with black2.99:1WCAG normal text: Fail
Greyscale equivalent#4E4E4E
Inverted#99C538

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#005BCBno red cones; affects about 1% of men; ΔE 29.7 from the original
Deuteranopia#0056C4no green cones; the most common form, about 1% of men; ΔE 29.1 from the original
Tritanopia#465F7Dno blue cones; rare, and affects men and women equally; ΔE 70.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.01:1WCAG large text: AAA
Contrast with black, large text2.99:1WCAG large text: Fail

Named colours

Dark orchid · ΔE 16.1Medium slateblue · ΔE 17.8Slate blue · ΔE 19.3Blue violet · ΔE 20.6Rebecca purple · ΔE 21.8Indigo · ΔE 21.8
Nearest named CSS colourDark orchid (#9932CC)ΔE 16.13, a distinctly different colour
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9BC73A
Analogous#3A55C7, #AC3AC7
Triadic#C7663A, #3AC766
Split complementary#C7AD3A, #54C73A
Tetradic#C73A55, #9BC73A, #3AC7AC

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E1D9F4
Lighter +30%#C3B1E9
Lighter +20%#A489DE
Lighter +10%#8562D2
Darker −10%#512EA0
Darker −20%#3D2279
Darker −30%#291751
Darker −40%#150C29
More saturated +25%#5A1AE7
Less saturated −25%#725AA7

Channel breakdown

R102
G58
B199
Red102 (40%)
Green58 (22.7%)
Blue199 (78%)
Hue258.72°
Saturation (HSL)55.73%
Lightness50.39%
Dominant channelBlue
Hex per channelR 66 · G 3A · B C7

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Every value on this page was computed from “663ac7” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.