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Recognised as Colour

#40357B

  • #40357B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#40357B is a blue with RGB values 64, 53, 123 and HSL 249°, 40%, 35%. It is a dark colour, so white text on it reaches 10.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#40357B#40357B
HEX#40357B
RGBrgb(64, 53, 123)
RGB (0–1)0.251, 0.2078, 0.4824
RGB percentages25.1%, 20.8%, 48.2%
HSLhsl(249.4, 39.8%, 34.5%)
HSV / HSBhsv(249.4, 56.9%, 48.2%)
CMYK48%, 56.9%, 0%, 51.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,207,995
CSS custom property--colour: #40357B;

Brightness & contrast

Relative luminance0.05066WCAG 2.x, 0 is black and 1 is white
Perceived brightness67.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.43:1
Contrast with white10.43:1WCAG normal text: AAA
Contrast with black2.01:1WCAG normal text: Fail
Greyscale equivalent#3C3C3C
Inverted#BFCA84

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0F417Dno red cones; affects about 1% of men; ΔE 16 from the original
Deuteranopia#0E3E79no green cones; the most common form, about 1% of men; ΔE 15.7 from the original
Tritanopia#2D4452no blue cones; rare, and affects men and women equally; ΔE 39.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.43:1WCAG large text: AAA
Contrast with black, large text2.01:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 5.7Midnight blue · ΔE 17.4Rebecca purple · ΔE 21.5Slate blue · ΔE 29.2Indigo · ΔE 31.9Medium purple · ΔE 32.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 5.66, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#707B35
Analogous#354D7B, #63357B
Triadic#7B4035, #357B40
Split complementary#7B6335, #4D7B35
Tetradic#7B354D, #707B35, #357B63

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#ACA4D8
Lighter +30%#8C81C8
Lighter +20%#6B5DB9
Lighter +10%#53449F
Darker −10%#2D2657
Darker −20%#1B1634
Darker −30%#080710
Darker −40%#000000
More saturated +25%#311F91
Less saturated −25%#4F4B65

Channel breakdown

R64
G53
B123
Red64 (25.1%)
Green53 (20.8%)
Blue123 (48.2%)
Hue249.43°
Saturation (HSL)39.77%
Lightness34.51%
Dominant channelBlue
Hex per channelR 40 · G 35 · B 7B

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Every value on this page was computed from “40357b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.