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Recognised as Colour

#3F41BB

  • #3F41BB
  • Blue
  • Dark
  • Nearest: Slate blue

#3F41BB is a blue with RGB values 63, 65, 187 and HSL 239°, 50%, 49%. It is a dark colour, so white text on it reaches 7.8:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#3F41BB#3F41BB
HEX#3F41BB
RGBrgb(63, 65, 187)
RGB (0–1)0.2471, 0.2549, 0.7333
RGB percentages24.7%, 25.5%, 73.3%
HSLhsl(239, 49.6%, 49%)
HSV / HSBhsv(239, 66.3%, 73.3%)
CMYK66.3%, 65.2%, 0%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,145,595
CSS custom property--colour: #3F41BB;

Brightness & contrast

Relative luminance0.08425WCAG 2.x, 0 is black and 1 is white
Perceived brightness87.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.82:1
Contrast with white7.82:1WCAG normal text: AAA
Contrast with black2.69:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#C0BE44

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0058BFno red cones; affects about 1% of men; ΔE 19.6 from the original
Deuteranopia#004CB9no green cones; the most common form, about 1% of men; ΔE 13.1 from the original
Tritanopia#006178no blue cones; rare, and affects men and women equally; ΔE 69.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.82:1WCAG large text: AAA
Contrast with black, large text2.69:1WCAG large text: Fail

Named colours

Slate blue · ΔE 12.6Royal blue · ΔE 17.4Medium slateblue · ΔE 17.6Rebecca purple · ΔE 18.2Indigo · ΔE 22.9Navy · ΔE 23.9
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 12.58, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BBB93F
Analogous#3F7FBB, #7B3FBB
Triadic#BB3F41, #41BB3F
Split complementary#BB7B3F, #7FBB3F
Tetradic#BB3F7F, #BBB93F, #3FBB7B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D5D6F1
Lighter +30%#AFB0E4
Lighter +20%#898AD7
Lighter +10%#6364CA
Darker −10%#323495
Darker −20%#25266F
Darker −30%#181949
Darker −40%#0C0C22
More saturated +25%#2023DA
Less saturated −25%#5E5F9C

Channel breakdown

R63
G65
B187
Red63 (24.7%)
Green65 (25.5%)
Blue187 (73.3%)
Hue239.03°
Saturation (HSL)49.6%
Lightness49.02%
Dominant channelBlue
Hex per channelR 3F · G 41 · B BB

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Every value on this page was computed from “3f41bb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.