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Recognised as Colour

#3F4F71

  • #3F4F71
  • Blue
  • Dark
  • Nearest: Slate grey

#3F4F71 is a blue with RGB values 63, 79, 113 and HSL 221°, 28%, 35%. It is a dark colour, so white text on it reaches 8.2:1 contrast (AAA for normal text). The nearest named colour is Slate grey.

Colour values

#3F4F71#3F4F71
HEX#3F4F71
RGBrgb(63, 79, 113)
RGB (0–1)0.2471, 0.3098, 0.4431
RGB percentages24.7%, 31%, 44.3%
HSLhsl(220.8, 28.4%, 34.5%)
HSV / HSBhsv(220.8, 44.2%, 44.3%)
CMYK44.2%, 30.1%, 0%, 55.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,149,105
CSS custom property--colour: #3F4F71;

Brightness & contrast

Relative luminance0.07841WCAG 2.x, 0 is black and 1 is white
Perceived brightness79.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.18:1
Contrast with white8.18:1WCAG normal text: AAA
Contrast with black2.57:1WCAG normal text: Fail
Greyscale equivalent#4E4E4E
Inverted#C0B08E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#435272no red cones; affects about 1% of men; ΔE 1.9 from the original
Deuteranopia#3E4D70no green cones; the most common form, about 1% of men; ΔE 1.1 from the original
Tritanopia#2E565Bno blue cones; rare, and affects men and women equally; ΔE 21.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.18:1WCAG large text: AAA
Contrast with black, large text2.57:1WCAG large text: Fail

Named colours

Slate grey · ΔE 22.8Steel blue · ΔE 22.9Dark slate grey · ΔE 23.5Dim grey · ΔE 24.3Light slate grey · ΔE 25.2Gray · ΔE 29.5
Nearest named CSS colourSlate grey (#708090)ΔE 22.79, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#71613F
Analogous#3F6871, #483F71
Triadic#713F4F, #4F713F
Split complementary#71483F, #68713F
Tetradic#713F68, #71613F, #3F7148

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#ACB7D0
Lighter +30%#8B9BBE
Lighter +20%#6A7FAC
Lighter +10%#516692
Darker −10%#2D3850
Darker −20%#1A2130
Darker −30%#080A0F
Darker −40%#000000
More saturated +25%#294787
Less saturated −25%#55575B

Channel breakdown

R63
G79
B113
Red63 (24.7%)
Green79 (31%)
Blue113 (44.3%)
Hue220.8°
Saturation (HSL)28.41%
Lightness34.51%
Dominant channelBlue
Hex per channelR 3F · G 4F · B 71

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Every value on this page was computed from “3f4f71” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.