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Recognised as Colour

#3F3381

  • #3F3381
  • Blue
  • Dark
  • Nearest: Dark slateblue

#3F3381 is a blue with RGB values 63, 51, 129 and HSL 249°, 43%, 35%. It is a dark colour, so white text on it reaches 10.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#3F3381#3F3381
HEX#3F3381
RGBrgb(63, 51, 129)
RGB (0–1)0.2471, 0.2, 0.5059
RGB percentages24.7%, 20%, 50.6%
HSLhsl(249.2, 43.3%, 35.3%)
HSV / HSBhsv(249.2, 60.5%, 50.6%)
CMYK51.2%, 60.5%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,141,953
CSS custom property--colour: #3F3381;

Brightness & contrast

Relative luminance0.05009WCAG 2.x, 0 is black and 1 is white
Perceived brightness67.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.49:1
Contrast with white10.49:1WCAG normal text: AAA
Contrast with black2:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#C0CC7E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004184no red cones; affects about 1% of men; ΔE 17.1 from the original
Deuteranopia#003D7Fno green cones; the most common form, about 1% of men; ΔE 16.4 from the original
Tritanopia#274555no blue cones; rare, and affects men and women equally; ΔE 44.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.49:1WCAG large text: AAA
Contrast with black, large text2:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 4.2Midnight blue · ΔE 13.8Rebecca purple · ΔE 17.5Slate blue · ΔE 25.6Indigo · ΔE 27.5Medium purple · ΔE 30.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 4.24, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#758133
Analogous#334E81, #663381
Triadic#813F33, #33813F
Split complementary#816633, #4E8133
Tetradic#81334E, #758133, #338166

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#ADA5DB
Lighter +30%#8C80CD
Lighter +20%#6B5CBE
Lighter +10%#5141A6
Darker −10%#2D255C
Darker −20%#1B1638
Darker −30%#090813
Darker −40%#000000
More saturated +25%#2F1C98
Less saturated −25%#4F4A6A

Channel breakdown

R63
G51
B129
Red63 (24.7%)
Green51 (20%)
Blue129 (50.6%)
Hue249.23°
Saturation (HSL)43.33%
Lightness35.29%
Dominant channelBlue
Hex per channelR 3F · G 33 · B 81

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Every value on this page was computed from “3f3381” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.