Colour

#637BB8

#637BB8
Blue
Dark
Nearest: Steel blue

#637BB8 is a blue with RGB values 99, 123, 184 and HSL 223°, 37%, 55%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#637BB8#637BB8

HEX#637BB8

RGBrgb(99, 123, 184)

RGB (0–1)0.3882, 0.4824, 0.7216

RGB percentages38.8%, 48.2%, 72.2%

HSLhsl(223.1, 37.4%, 55.5%)

HSV / HSBhsv(223.1, 46.2%, 72.2%)

CMYK46.2%, 33.2%, 0%, 27.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer6,519,736

CSS custom property--colour: #637BB8;

Brightness & contrast

Relative luminance0.20279WCAG 2.x, 0 is black and 1 is white

Perceived brightness125.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.06:1

Contrast with white4.15:1WCAG normal text: Fail

Contrast with black5.06:1WCAG normal text: AA

Greyscale equivalent#7A7A7A

Inverted#9C8447

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6580BBno red cones; affects about 1% of men; ΔE 2.4 from the original

Deuteranopia#5C79B7no green cones; the most common form, about 1% of men; ΔE 1.7 from the original

Tritanopia#438891no blue cones; rare, and affects men and women equally; ΔE 35.7 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text4.15:1WCAG large text: AA

Contrast with black, large text5.06:1WCAG large text: AAA

Named colours

Steel blue · ΔE 12.3 Cornflower blue · ΔE 17.5 Light slate grey · ΔE 26.1 Slate grey · ΔE 26.3 Dark slateblue · ΔE 28.9 Dodgerblue · ΔE 29.5

Nearest named CSS colourSteel blue (#4682B4)ΔE 12.31, a distinctly different colour

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#B8A063

Analogous#63A6B8, #7563B8

Triadic#B8637B, #7BB863

Split complementary#B87663, #A6B863

Tetradic#B863A6, #B8A063, #63B876

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#EFF2F8

Lighter +30%#CCD4E8

Lighter +20%#A9B6D8

Lighter +10%#8699C8

Darker −10%#49619F

Darker −20%#394C7C

Darker −30%#293659

Darker −40%#192136

More saturated +25%#476FD4

Less saturated −25%#7F879C

Channel breakdown

R99

G123

B184

Red99 (38.8%)

Green123 (48.2%)

Blue184 (72.2%)

Hue223.06°

Saturation (HSL)37.44%

Lightness55.49%

Dominant channelBlue

Hex per channelR 63 · G 7B · B B8

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#637BB8

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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