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Recognised as Colour

#638FA5

  • #638FA5
  • Blue
  • Dark
  • Nearest: Light slate grey

#638FA5 is a blue with RGB values 99, 143, 165 and HSL 200°, 27%, 52%. It is a dark colour, so black text on it reaches 6:1 contrast (AA for normal text). The nearest named colour is Light slate grey.

Colour values

#638FA5#638FA5
HEX#638FA5
RGBrgb(99, 143, 165)
RGB (0–1)0.3882, 0.5608, 0.6471
RGB percentages38.8%, 56.1%, 64.7%
HSLhsl(200, 26.8%, 51.8%)
HSV / HSBhsv(200, 40%, 64.7%)
CMYK40%, 13.3%, 0%, 35.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,524,837
CSS custom property--colour: #638FA5;

Brightness & contrast

Relative luminance0.25014WCAG 2.x, 0 is black and 1 is white
Perceived brightness134.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6:1
Contrast with white3.5:1WCAG normal text: Fail
Contrast with black6:1WCAG normal text: AA
Greyscale equivalent#878787
Inverted#9C705A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#848DA6no red cones; affects about 1% of men; ΔE 11.7 from the original
Deuteranopia#7B86A5no green cones; the most common form, about 1% of men; ΔE 12.4 from the original
Tritanopia#4A9596no blue cones; rare, and affects men and women equally; ΔE 16.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.5:1WCAG large text: AA
Contrast with black, large text6:1WCAG large text: AAA

Named colours

Light slate grey · ΔE 8.8Slate grey · ΔE 10Cadetblue · ΔE 14.4Steel blue · ΔE 17.3Gray · ΔE 19.1Dark grey · ΔE 22.3
Nearest named CSS colourLight slate grey (#778899)ΔE 8.76, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A57963
Analogous#63A59A, #636EA5
Triadic#A5638F, #8FA563
Split complementary#A5636E, #A59A63
Tetradic#9A63A5, #A57963, #6EA563

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E4ECF0
Lighter +30%#C4D5DD
Lighter +20%#A4BDCA
Lighter +10%#83A6B8
Darker −10%#4E7487
Darker −20%#3B5867
Darker −30%#293C46
Darker −40%#162126
More saturated +25%#4499C4
Less saturated −25%#828586

Channel breakdown

R99
G143
B165
Red99 (38.8%)
Green143 (56.1%)
Blue165 (64.7%)
Hue200°
Saturation (HSL)26.83%
Lightness51.76%
Dominant channelBlue
Hex per channelR 63 · G 8F · B A5

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Every value on this page was computed from “638fa5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.