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Recognised as Colour

#6366FF

  • #6366FF
  • Blue
  • Dark
  • Nearest: Medium slateblue

#6366FF is a blue with RGB values 99, 102, 255 and HSL 239°, 100%, 69%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Medium slateblue.

Colour values

#6366FF#6366FF
HEX#6366FF
RGBrgb(99, 102, 255)
RGB (0–1)0.3882, 0.4, 1
RGB percentages38.8%, 40%, 100%
HSLhsl(238.8, 100%, 69.4%)
HSV / HSBhsv(238.8, 61.2%, 100%)
CMYK61.2%, 60%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,514,431
CSS custom property--colour: #6366FF;

Brightness & contrast

Relative luminance0.19375WCAG 2.x, 0 is black and 1 is white
Perceived brightness128.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.88:1
Contrast with white4.31:1WCAG normal text: Fail
Contrast with black4.88:1WCAG normal text: AA
Greyscale equivalent#707070
Inverted#9C9900

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0081FFno red cones; affects about 1% of men; ΔE 26 from the original
Deuteranopia#0073FCno green cones; the most common form, about 1% of men; ΔE 17.4 from the original
Tritanopia#008CA9no blue cones; rare, and affects men and women equally; ΔE 82.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.31:1WCAG large text: AA
Contrast with black, large text4.88:1WCAG large text: AAA

Named colours

Medium slateblue · ΔE 11.5Royal blue · ΔE 20.6Slate blue · ΔE 21Medium purple · ΔE 27.6Blue violet · ΔE 28.2Dark orchid · ΔE 28.6
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 11.46, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFFC63
Analogous#63B4FF, #AE63FF
Triadic#FF6366, #66FF63
Split complementary#FFAE63, #B4FF63
Tetradic#FF63B4, #FFFC63, #63FFAE

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#FCFCFF
Lighter +20%#C9CAFF
Lighter +10%#9698FF
Darker −10%#3034FF
Darker −20%#0005FC
Darker −30%#0004C9
Darker −40%#000396
More saturated +25%#6366FF
Less saturated −25%#7679EC

Channel breakdown

R99
G102
B255
Red99 (38.8%)
Green102 (40%)
Blue255 (100%)
Hue238.85°
Saturation (HSL)100%
Lightness69.41%
Dominant channelBlue
Hex per channelR 63 · G 66 · B FF

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Every value on this page was computed from “6366ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.