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Recognised as Colour

#4581DD

  • #4581DD
  • Blue
  • Dark
  • Nearest: Cornflower blue

#4581DD is a blue with RGB values 69, 129, 221 and HSL 216°, 69%, 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

#4581DD#4581DD
HEX#4581DD
RGBrgb(69, 129, 221)
RGB (0–1)0.2706, 0.5059, 0.8667
RGB percentages27.1%, 50.6%, 86.7%
HSLhsl(216.3, 69.1%, 56.9%)
HSV / HSBhsv(216.3, 68.8%, 86.7%)
CMYK68.8%, 41.6%, 0%, 13.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,555,229
CSS custom property--colour: #4581DD;

Brightness & contrast

Relative luminance0.22186WCAG 2.x, 0 is black and 1 is white
Perceived brightness129.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.44:1
Contrast with white3.86:1WCAG normal text: Fail
Contrast with black5.44:1WCAG normal text: AA
Greyscale equivalent#7B7B7B
Inverted#BA7E22

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#5689E1no red cones; affects about 1% of men; ΔE 4.3 from the original
Deuteranopia#3D7BDBno green cones; the most common form, about 1% of men; ΔE 3.5 from the original
Tritanopia#0096A4no blue cones; rare, and affects men and women equally; ΔE 52.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.86:1WCAG large text: AA
Contrast with black, large text5.44:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 8.5Dodgerblue · ΔE 11.9Royal blue · ΔE 21.2Steel blue · ΔE 25.2Medium purple · ΔE 26.5Slate blue · ΔE 27.5
Nearest named CSS colourCornflower blue (#6495ED)ΔE 8.51, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DDA145
Analogous#45CDDD, #5545DD
Triadic#DD4581, #81DD45
Split complementary#DD5545, #CDDD45
Tetradic#DD45CD, #DDA145, #45DD55

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F1F6FD
Lighter +30%#C6D9F5
Lighter +20%#9BBBED
Lighter +10%#709EE5
Darker −10%#2566CA
Darker −20%#1D509F
Darker −30%#153B74
Darker −40%#0D2549
More saturated +25%#297BF9
Less saturated −25%#6087C2

Channel breakdown

R69
G129
B221
Red69 (27.1%)
Green129 (50.6%)
Blue221 (86.7%)
Hue216.32°
Saturation (HSL)69.09%
Lightness56.86%
Dominant channelBlue
Hex per channelR 45 · G 81 · B DD

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Every value on this page was computed from “4581dd” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.