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Recognised as Colour

#4237AA

  • #4237AA
  • Blue
  • Dark
  • Nearest: Rebecca purple

#4237AA is a blue with RGB values 66, 55, 170 and HSL 246°, 51%, 44%. It is a dark colour, so white text on it reaches 8.9:1 contrast (AAA for normal text). The nearest named colour is Rebecca purple.

Colour values

#4237AA#4237AA
HEX#4237AA
RGBrgb(66, 55, 170)
RGB (0–1)0.2588, 0.2157, 0.6667
RGB percentages25.9%, 21.6%, 66.7%
HSLhsl(245.7, 51.1%, 44.1%)
HSV / HSBhsv(245.7, 67.6%, 66.7%)
CMYK61.2%, 67.6%, 0%, 33.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,339,626
CSS custom property--colour: #4237AA;

Brightness & contrast

Relative luminance0.06793WCAG 2.x, 0 is black and 1 is white
Perceived brightness79.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.9:1
Contrast with white8.9:1WCAG normal text: AAA
Contrast with black2.36:1WCAG normal text: Fail
Greyscale equivalent#424242
Inverted#BDC855

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004EAEno red cones; affects about 1% of men; ΔE 20.3 from the original
Deuteranopia#0045A8no green cones; the most common form, about 1% of men; ΔE 16.2 from the original
Tritanopia#00556Cno blue cones; rare, and affects men and women equally; ΔE 65.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.9:1WCAG large text: AAA
Contrast with black, large text2.36:1WCAG large text: Fail

Named colours

Rebecca purple · ΔE 13.8Slate blue · ΔE 14.4Indigo · ΔE 18.3Midnight blue · ΔE 20Navy · ΔE 20.9Royal blue · ΔE 21.3
Nearest named CSS colourRebecca purple (#663399)ΔE 13.75, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9FAA37
Analogous#3765AA, #7B37AA
Triadic#AA4237, #37AA42
Split complementary#AA7C37, #65AA37
Tetradic#AA3766, #9FAA37, #37AA7C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C6C2EB
Lighter +30%#A29BDF
Lighter +20%#7E75D2
Lighter +10%#5A4EC6
Darker −10%#332B83
Darker −20%#241E5D
Darker −30%#151236
Darker −40%#060510
More saturated +25%#2B1BC6
Less saturated −25%#59538E

Channel breakdown

R66
G55
B170
Red66 (25.9%)
Green55 (21.6%)
Blue170 (66.7%)
Hue245.74°
Saturation (HSL)51.11%
Lightness44.12%
Dominant channelBlue
Hex per channelR 42 · G 37 · B AA

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Every value on this page was computed from “4237aa” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.