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Colour

#5581CF

  • #5581CF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#5581CF is a blue with RGB values 85, 129, 207 and HSL 218°, 56%, 57%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#5581CF#5581CF
HEX#5581CF
RGBrgb(85, 129, 207)
RGB (0–1)0.3333, 0.5059, 0.8118
RGB percentages33.3%, 50.6%, 81.2%
HSLhsl(218.4, 56%, 57.3%)
HSV / HSBhsv(218.4, 58.9%, 81.2%)
CMYK58.9%, 37.7%, 0%, 18.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,603,791
CSS custom property--colour: #5581CF;

Brightness & contrast

Relative luminance0.22137WCAG 2.x, 0 is black and 1 is white
Perceived brightness129.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.43:1
Contrast with white3.87:1WCAG normal text: Fail
Contrast with black5.43:1WCAG normal text: AA
Greyscale equivalent#7D7D7D
Inverted#AA7E30

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6088D2no red cones; affects about 1% of men; ΔE 3.8 from the original
Deuteranopia#507CCDno green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#00929Eno blue cones; rare, and affects men and women equally; ΔE 46.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.87:1WCAG large text: AA
Contrast with black, large text5.43:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 9Steel blue · ΔE 17.9Dodgerblue · ΔE 19.3Royal blue · ΔE 27.8Medium purple · ΔE 28.8Dark slateblue · ΔE 29.4
Nearest named CSS colourCornflower blue (#6495ED)ΔE 8.98, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CFA355
Analogous#55BECF, #6655CF
Triadic#CF5581, #81CF55
Split complementary#CF6655, #BECF55
Tetradic#CF55BE, #CFA355, #55CF66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F4F7FC
Lighter +30%#CCD9F1
Lighter +20%#A5BCE5
Lighter +10%#7D9EDA
Darker −10%#3566BC
Darker −20%#2A5094
Darker −30%#1F3B6C
Darker −40%#132545
More saturated +25%#3A79EA
Less saturated −25%#7089B4

Channel breakdown

R85
G129
B207
Red85 (33.3%)
Green129 (50.6%)
Blue207 (81.2%)
Hue218.36°
Saturation (HSL)55.96%
Lightness57.25%
Dominant channelBlue
Hex per channelR 55 · G 81 · B CF

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Every value on this page was computed from “5581cf” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.