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Recognised as Colour

#288BFF

  • #288BFF
  • Blue
  • Dark
  • Nearest: Dodgerblue

#288BFF is a blue with RGB values 40, 139, 255 and HSL 212°, 100%, 58%. It is a dark colour, so black text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Dodgerblue.

Colour values

#288BFF#288BFF
HEX#288BFF
RGBrgb(40, 139, 255)
RGB (0–1)0.1569, 0.5451, 1
RGB percentages15.7%, 54.5%, 100%
HSLhsl(212.4, 100%, 57.8%)
HSV / HSBhsv(212.4, 84.3%, 100%)
CMYK84.3%, 45.5%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,657,279
CSS custom property--colour: #288BFF;

Brightness & contrast

Relative luminance0.26136WCAG 2.x, 0 is black and 1 is white
Perceived brightness138.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.23:1
Contrast with white3.37:1WCAG normal text: Fail
Contrast with black6.23:1WCAG normal text: AA
Greyscale equivalent#7E7E7E
Inverted#D77400

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#4B96FFno red cones; affects about 1% of men; ΔE 8.1 from the original
Deuteranopia#0783FDno green cones; the most common form, about 1% of men; ΔE 5 from the original
Tritanopia#00A7B9no blue cones; rare, and affects men and women equally; ΔE 62.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.37:1WCAG large text: AA
Contrast with black, large text6.23:1WCAG large text: AAA

Named colours

Dodgerblue · ΔE 4.3Royal blue · ΔE 16.3Cornflower blue · ΔE 17Slate blue · ΔE 26.9Medium purple · ΔE 27.9Medium slateblue · ΔE 28.1
Nearest named CSS colourDodgerblue (#1E90FF)ΔE 4.32, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF9C28
Analogous#28F6FF, #3128FF
Triadic#FF288B, #8BFF28
Split complementary#FF3128, #F6FF28
Tetradic#FF28F6, #FF9C28, #28FF31

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F4F9FF
Lighter +30%#C1DEFF
Lighter +20%#8EC2FF
Lighter +10%#5BA7FF
Darker −10%#0070F4
Darker −20%#0059C1
Darker −30%#00418E
Darker −40%#002A5B
More saturated +25%#288BFF
Less saturated −25%#438DE4

Channel breakdown

R40
G139
B255
Red40 (15.7%)
Green139 (54.5%)
Blue255 (100%)
Hue212.37°
Saturation (HSL)100%
Lightness57.84%
Dominant channelBlue
Hex per channelR 28 · G 8B · B FF

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Every value on this page was computed from “288bff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.