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Recognised as Colour

#378FEE

  • #378FEE
  • Blue
  • Dark
  • Nearest: Cornflower blue

#378FEE is a blue with RGB values 55, 143, 238 and HSL 211°, 84%, 57%. It is a dark colour, so black text on it reaches 6.3:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#378FEE#378FEE
HEX#378FEE
RGBrgb(55, 143, 238)
RGB (0–1)0.2157, 0.5608, 0.9333
RGB percentages21.6%, 56.1%, 93.3%
HSLhsl(211.1, 84.3%, 57.5%)
HSV / HSBhsv(211.1, 76.9%, 93.3%)
CMYK76.9%, 39.9%, 0%, 6.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,641,326
CSS custom property--colour: #378FEE;

Brightness & contrast

Relative luminance0.2663WCAG 2.x, 0 is black and 1 is white
Perceived brightness139.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.33:1
Contrast with white3.32:1WCAG normal text: Fail
Contrast with black6.33:1WCAG normal text: AA
Greyscale equivalent#838383
Inverted#C87011

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6196F2no red cones; affects about 1% of men; ΔE 6.3 from the original
Deuteranopia#4385ECno green cones; the most common form, about 1% of men; ΔE 7.8 from the original
Tritanopia#00A6B3no blue cones; rare, and affects men and women equally; ΔE 53.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.32:1WCAG large text: AA
Contrast with black, large text6.33:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 7.4Dodgerblue · ΔE 9Royal blue · ΔE 24.8Steel blue · ΔE 26Deep skyblue · ΔE 30.5Medium purple · ΔE 31.1
Nearest named CSS colourCornflower blue (#6495ED)ΔE 7.41, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#EE9637
Analogous#37EBEE, #3A37EE
Triadic#EE378F, #8FEE37
Split complementary#EE3A37, #EBEE37
Tetradic#EE37EB, #EE9637, #37EE3A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F3F8FE
Lighter +30%#C4DEFA
Lighter +20%#95C4F6
Lighter +10%#66A9F2
Darker −10%#1375DF
Darker −20%#0F5CB0
Darker −30%#0B4481
Darker −40%#072B52
More saturated +25%#268EFF
Less saturated −25%#5290D3

Channel breakdown

R55
G143
B238
Red55 (21.6%)
Green143 (56.1%)
Blue238 (93.3%)
Hue211.15°
Saturation (HSL)84.33%
Lightness57.45%
Dominant channelBlue
Hex per channelR 37 · G 8F · B EE

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Every value on this page was computed from “378fee” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.