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Recognised as Colour

#3F77BB

  • #3F77BB
  • Blue
  • Dark
  • Nearest: Steel blue

#3F77BB is a blue with RGB values 63, 119, 187 and HSL 213°, 50%, 49%. It is a dark colour, so white text on it reaches 4.6:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#3F77BB#3F77BB
HEX#3F77BB
RGBrgb(63, 119, 187)
RGB (0–1)0.2471, 0.4667, 0.7333
RGB percentages24.7%, 46.7%, 73.3%
HSLhsl(212.9, 49.6%, 49%)
HSV / HSBhsv(212.9, 66.3%, 73.3%)
CMYK66.3%, 36.4%, 0%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,159,419
CSS custom property--colour: #3F77BB;

Brightness & contrast

Relative luminance0.17838WCAG 2.x, 0 is black and 1 is white
Perceived brightness116.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.6:1
Contrast with white4.6:1WCAG normal text: AA
Contrast with black4.57:1WCAG normal text: AA
Greyscale equivalent#707070
Inverted#C08844

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#597CBEno red cones; affects about 1% of men; ΔE 5.1 from the original
Deuteranopia#4770BAno green cones; the most common form, about 1% of men; ΔE 6.1 from the original
Tritanopia#008790no blue cones; rare, and affects men and women equally; ΔE 41.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.6:1WCAG large text: AAA
Contrast with black, large text4.57:1WCAG large text: AAA

Named colours

Steel blue · ΔE 12.3Cornflower blue · ΔE 16Dodgerblue · ΔE 25.2Dark slateblue · ΔE 29.1Light slate grey · ΔE 31.4Slate grey · ΔE 31.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 12.27, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BB833F
Analogous#3FB5BB, #453FBB
Triadic#BB3F77, #77BB3F
Split complementary#BB453F, #B5BB3F
Tetradic#BB3FB5, #BB833F, #3FBB45

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D5E2F1
Lighter +30%#AFC7E4
Lighter +20%#89ACD7
Lighter +10%#6391CA
Darker −10%#325F95
Darker −20%#25466F
Darker −30%#182E49
Darker −40%#0C1622
More saturated +25%#2074DA
Less saturated −25%#5E7A9C

Channel breakdown

R63
G119
B187
Red63 (24.7%)
Green119 (46.7%)
Blue187 (73.3%)
Hue212.9°
Saturation (HSL)49.6%
Lightness49.02%
Dominant channelBlue
Hex per channelR 3F · G 77 · B BB

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Every value on this page was computed from “3f77bb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.