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Colour

#287BFF

  • #287BFF
  • Blue
  • Dark
  • Nearest: Royal blue

#287BFF is a blue with RGB values 40, 123, 255 and HSL 217°, 100%, 58%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#287BFF#287BFF
HEX#287BFF
RGBrgb(40, 123, 255)
RGB (0–1)0.1569, 0.4824, 1
RGB percentages15.7%, 48.2%, 100%
HSLhsl(216.8, 100%, 57.8%)
HSV / HSBhsv(216.8, 84.3%, 100%)
CMYK84.3%, 51.8%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,653,183
CSS custom property--colour: #287BFF;

Brightness & contrast

Relative luminance0.21837WCAG 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 5.37:1
Contrast with white3.91:1WCAG normal text: Fail
Contrast with black5.37:1WCAG normal text: AA
Greyscale equivalent#737373
Inverted#D78400

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#148BFFno red cones; affects about 1% of men; ΔE 13.4 from the original
Deuteranopia#0078FCno green cones; the most common form, about 1% of men; ΔE 1.9 from the original
Tritanopia#009CB1no blue cones; rare, and affects men and women equally; ΔE 72.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.91:1WCAG large text: AA
Contrast with black, large text5.37:1WCAG large text: AAA

Named colours

Royal blue · ΔE 9.7Dodgerblue · ΔE 17.1Medium slateblue · ΔE 18.9Slate blue · ΔE 21Medium purple · ΔE 25.9Cornflower blue · ΔE 28.2
Nearest named CSS colourRoyal blue (#4169E1)ΔE 9.66, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFAC28
Analogous#28E6FF, #4128FF
Triadic#FF287B, #7BFF28
Split complementary#FF4128, #E6FF28
Tetradic#FF28E6, #FFAC28, #28FF41

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F4F8FF
Lighter +30%#C1D9FF
Lighter +20%#8EBAFF
Lighter +10%#5B9AFF
Darker −10%#005EF4
Darker −20%#004BC1
Darker −30%#00378E
Darker −40%#00235B
More saturated +25%#287BFF
Less saturated −25%#4381E4

Channel breakdown

R40
G123
B255
Red40 (15.7%)
Green123 (48.2%)
Blue255 (100%)
Hue216.84°
Saturation (HSL)100%
Lightness57.84%
Dominant channelBlue
Hex per channelR 28 · G 7B · B FF

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Every value on this page was computed from “287bff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.