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Colour

#637BAF

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

#637BAF is a blue with RGB values 99, 123, 175 and HSL 221°, 32%, 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

#637BAF#637BAF
HEX#637BAF
RGBrgb(99, 123, 175)
RGB (0–1)0.3882, 0.4824, 0.6863
RGB percentages38.8%, 48.2%, 68.6%
HSLhsl(221.1, 32.2%, 53.7%)
HSV / HSBhsv(221.1, 43.4%, 68.6%)
CMYK43.4%, 29.7%, 0%, 31.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,519,727
CSS custom property--colour: #637BAF;

Brightness & contrast

Relative luminance0.19914WCAG 2.x, 0 is black and 1 is white
Perceived brightness123.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.98:1
Contrast with white4.21:1WCAG normal text: Fail
Contrast with black4.98:1WCAG normal text: AA
Greyscale equivalent#7A7A7A
Inverted#9C8450

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#687FB1no red cones; affects about 1% of men; ΔE 2 from the original
Deuteranopia#6178AEno green cones; the most common form, about 1% of men; ΔE 1.7 from the original
Tritanopia#48868Dno blue cones; rare, and affects men and women equally; ΔE 30.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.21:1WCAG large text: AA
Contrast with black, large text4.98:1WCAG large text: AAA

Named colours

Steel blue · ΔE 9.5Light slate grey · ΔE 21Slate grey · ΔE 21.1Cornflower blue · ΔE 21.9Gray · ΔE 30.8Light steelblue · ΔE 31.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 9.53, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AF9763
Analogous#63A1AF, #7163AF
Triadic#AF637B, #7BAF63
Split complementary#AF7163, #A1AF63
Tetradic#AF63A1, #AF9763, #63AF71

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EAEDF4
Lighter +30%#C8D1E3
Lighter +20%#A6B4D2
Lighter +10%#8598C0
Darker −10%#4C6293
Darker −20%#3A4C72
Darker −30%#293550
Darker −40%#181F2E
More saturated +25%#4670CC
Less saturated −25%#818692

Channel breakdown

R99
G123
B175
Red99 (38.8%)
Green123 (48.2%)
Blue175 (68.6%)
Hue221.05°
Saturation (HSL)32.2%
Lightness53.73%
Dominant channelBlue
Hex per channelR 63 · G 7B · B AF

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