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Recognised as Colour

#638FDF

  • #638FDF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#638FDF is a blue with RGB values 99, 143, 223 and HSL 219°, 66%, 63%. It is a dark colour, so black text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#638FDF#638FDF
HEX#638FDF
RGBrgb(99, 143, 223)
RGB (0–1)0.3882, 0.5608, 0.8745
RGB percentages38.8%, 56.1%, 87.5%
HSLhsl(218.7, 66%, 63.1%)
HSV / HSBhsv(218.7, 55.6%, 87.5%)
CMYK55.6%, 35.9%, 0%, 12.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,524,895
CSS custom property--colour: #638FDF;

Brightness & contrast

Relative luminance0.27625WCAG 2.x, 0 is black and 1 is white
Perceived brightness143.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.53:1
Contrast with white3.22:1WCAG normal text: Fail
Contrast with black6.53:1WCAG normal text: AA
Greyscale equivalent#8B8B8B
Inverted#9C7020

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6E96E2no red cones; affects about 1% of men; ΔE 3.7 from the original
Deuteranopia#5F8ADDno green cones; the most common form, about 1% of men; ΔE 2.7 from the original
Tritanopia#0CA1ACno blue cones; rare, and affects men and women equally; ΔE 48.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.22:1WCAG large text: AA
Contrast with black, large text6.53:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 4.8Dodgerblue · ΔE 18.2Steel blue · ΔE 19.3Deep skyblue · ΔE 29.1Royal blue · ΔE 29.4Medium purple · ΔE 29.4
Nearest named CSS colourCornflower blue (#6495ED)ΔE 4.79, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DFB363
Analogous#63CDDF, #7563DF
Triadic#DF638F, #8FDF63
Split complementary#DF7563, #CDDF63
Tetradic#DF63CD, #DFB363, #63DF75

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#E2EAF9
Lighter +20%#B8CCF0
Lighter +10%#8DADE8
Darker −10%#3971D6
Darker −20%#2559B7
Darker −30%#1D448C
Darker −40%#143062
More saturated +25%#4B88F7
Less saturated −25%#7A96C8

Channel breakdown

R99
G143
B223
Red99 (38.8%)
Green143 (56.1%)
Blue223 (87.5%)
Hue218.71°
Saturation (HSL)65.96%
Lightness63.14%
Dominant channelBlue
Hex per channelR 63 · G 8F · B DF

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