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Recognised as Colour

#636C91

  • #636C91
  • Blue
  • Dark
  • Nearest: Slate grey

#636C91 is a blue with RGB values 99, 108, 145 and HSL 228°, 19%, 48%. It is a dark colour, so white text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#636C91#636C91
HEX#636C91
RGBrgb(99, 108, 145)
RGB (0–1)0.3882, 0.4235, 0.5686
RGB percentages38.8%, 42.4%, 56.9%
HSLhsl(228.3, 18.9%, 47.8%)
HSV / HSBhsv(228.3, 31.7%, 56.9%)
CMYK31.7%, 25.5%, 0%, 43.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,515,857
CSS custom property--colour: #636C91;

Brightness & contrast

Relative luminance0.15422WCAG 2.x, 0 is black and 1 is white
Perceived brightness110.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.14:1
Contrast with white5.14:1WCAG normal text: AA
Contrast with black4.08:1WCAG normal text: Fail
Greyscale equivalent#6D6D6D
Inverted#9C936E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#616F93no red cones; affects about 1% of men; ΔE 2 from the original
Deuteranopia#5D6C90no green cones; the most common form, about 1% of men; ΔE 2.2 from the original
Tritanopia#577379no blue cones; rare, and affects men and women equally; ΔE 20.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text5.14:1WCAG large text: AAA
Contrast with black, large text4.08:1WCAG large text: AA

Named colours

Slate grey · ΔE 14.9Steel blue · ΔE 15.9Light slate grey · ΔE 16.2Dim grey · ΔE 22.2Gray · ΔE 23.3Dark slate grey · ΔE 28.9
Nearest named CSS colourSlate grey (#708090)ΔE 14.89, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#918863
Analogous#638391, #716391
Triadic#91636C, #6C9163
Split complementary#917163, #839163
Tetradic#916383, #918863, #639171

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DADCE6
Lighter +30%#BCC0D1
Lighter +20%#9EA4BC
Lighter +10%#7F87A8
Darker −10%#4E5573
Darker −20%#3A3F54
Darker −30%#252836
Darker −40%#101218
More saturated +25%#4459AF
Less saturated −25%#7A7A7A

Channel breakdown

R99
G108
B145
Red99 (38.8%)
Green108 (42.4%)
Blue145 (56.9%)
Hue228.26°
Saturation (HSL)18.85%
Lightness47.84%
Dominant channelBlue
Hex per channelR 63 · G 6C · B 91

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Every value on this page was computed from “636c91” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.