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Colour

#637CB0

  • #637CB0
  • Blue
  • Dark
  • Nearest: Steel blue

#637CB0 is a blue with RGB values 99, 124, 176 and HSL 221°, 33%, 54%. It is a dark colour, so black text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#637CB0#637CB0
HEX#637CB0
RGBrgb(99, 124, 176)
RGB (0–1)0.3882, 0.4863, 0.6902
RGB percentages38.8%, 48.6%, 69%
HSLhsl(220.5, 32.8%, 53.9%)
HSV / HSBhsv(220.5, 43.8%, 69%)
CMYK43.8%, 29.5%, 0%, 31%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,519,984
CSS custom property--colour: #637CB0;

Brightness & contrast

Relative luminance0.20203WCAG 2.x, 0 is black and 1 is white
Perceived brightness124.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.04:1
Contrast with white4.17:1WCAG normal text: Fail
Contrast with black5.04:1WCAG normal text: AA
Greyscale equivalent#7A7A7A
Inverted#9C834F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6980B2no red cones; affects about 1% of men; ΔE 2.1 from the original
Deuteranopia#6179AFno green cones; the most common form, about 1% of men; ΔE 1.7 from the original
Tritanopia#47878Eno blue cones; rare, and affects men and women equally; ΔE 31 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.17:1WCAG large text: AA
Contrast with black, large text5.04:1WCAG large text: AAA

Named colours

Steel blue · ΔE 9.2Light slate grey · ΔE 20.9Slate grey · ΔE 21.1Cornflower blue · ΔE 21.8Gray · ΔE 30.8Light steelblue · ΔE 31.1
Nearest named CSS colourSteel blue (#4682B4)ΔE 9.2, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B09763
Analogous#63A2B0, #7163B0
Triadic#B0637C, #7CB063
Split complementary#B07163, #A2B063
Tetradic#B063A2, #B09763, #63B071

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EAEEF5
Lighter +30%#C9D1E3
Lighter +20%#A7B5D2
Lighter +10%#8598C1
Darker −10%#4B6395
Darker −20%#3A4D73
Darker −30%#293651
Darker −40%#181F2F
More saturated +25%#4672CD
Less saturated −25%#808693

Channel breakdown

R99
G124
B176
Red99 (38.8%)
Green124 (48.6%)
Blue176 (69%)
Hue220.52°
Saturation (HSL)32.77%
Lightness53.92%
Dominant channelBlue
Hex per channelR 63 · G 7C · B B0

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Every value on this page was computed from “637cb0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.