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Recognised as Colour

#155CEE

  • #155CEE
  • Blue
  • Dark
  • Nearest: Medium slateblue

#155CEE is a blue with RGB values 21, 92, 238 and HSL 220°, 86%, 51%. It is a dark colour, so white text on it reaches 5.5:1 contrast (AA for normal text). The nearest named colour is Medium slateblue.

Colour values

#155CEE#155CEE
HEX#155CEE
RGBrgb(21, 92, 238)
RGB (0–1)0.0824, 0.3608, 0.9333
RGB percentages8.2%, 36.1%, 93.3%
HSLhsl(220.4, 86.5%, 50.8%)
HSV / HSBhsv(220.4, 91.2%, 93.3%)
CMYK91.2%, 61.3%, 0%, 6.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,400,046
CSS custom property--colour: #155CEE;

Brightness & contrast

Relative luminance0.13987WCAG 2.x, 0 is black and 1 is white
Perceived brightness107.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.53:1
Contrast with white5.53:1WCAG normal text: AA
Contrast with black3.8:1WCAG normal text: Fail
Greyscale equivalent#575757
Inverted#EAA311

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0072F3no red cones; affects about 1% of men; ΔE 15.6 from the original
Deuteranopia#005FEBno green cones; the most common form, about 1% of men; ΔE 4.2 from the original
Tritanopia#00839Cno blue cones; rare, and affects men and women equally; ΔE 80.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.53:1WCAG large text: AAA
Contrast with black, large text3.8:1WCAG large text: AA

Named colours

Medium slateblue · ΔE 16.3Royal blue · ΔE 16.7Slate blue · ΔE 20.8Medium purple · ΔE 30.4Dodgerblue · ΔE 33.5Rebecca purple · ΔE 34.1
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 16.28, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#EEA715
Analogous#15C9EE, #3A15EE
Triadic#EE155C, #5CEE15
Split complementary#EE3A15, #C9EE15
Tetradic#EE15C9, #EEA715, #15EE3A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D3E0FC
Lighter +30%#A4BFF8
Lighter +20%#749EF5
Lighter +10%#457DF1
Darker −10%#0E49C2
Darker −20%#0B3792
Darker −30%#072563
Darker −40%#041333
More saturated +25%#0456FF
Less saturated −25%#3467CF

Channel breakdown

R21
G92
B238
Red21 (8.2%)
Green92 (36.1%)
Blue238 (93.3%)
Hue220.37°
Saturation (HSL)86.45%
Lightness50.78%
Dominant channelBlue
Hex per channelR 15 · G 5C · B EE

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Every value on this page was computed from “155cee” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.