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Recognised as Colour

#155EFF

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

#155EFF is a blue with RGB values 21, 94, 255 and HSL 221°, 100%, 54%. It is a dark colour, so white text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Medium slateblue.

Colour values

#155EFF#155EFF
HEX#155EFF
RGBrgb(21, 94, 255)
RGB (0–1)0.0824, 0.3686, 1
RGB percentages8.2%, 36.9%, 100%
HSLhsl(221.3, 100%, 54.1%)
HSV / HSBhsv(221.3, 91.8%, 100%)
CMYK91.8%, 63.1%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,400,575
CSS custom property--colour: #155EFF;

Brightness & contrast

Relative luminance0.15385WCAG 2.x, 0 is black and 1 is white
Perceived brightness112.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.15:1
Contrast with white5.15:1WCAG normal text: AA
Contrast with black4.08:1WCAG normal text: Fail
Greyscale equivalent#5A5A5A
Inverted#EAA100

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0078FFno red cones; affects about 1% of men; ΔE 20.9 from the original
Deuteranopia#0063FCno green cones; the most common form, about 1% of men; ΔE 5.6 from the original
Tritanopia#0089A6no blue cones; rare, and affects men and women equally; ΔE 86.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.15:1WCAG large text: AAA
Contrast with black, large text4.08:1WCAG large text: AA

Named colours

Medium slateblue · ΔE 20.4Royal blue · ΔE 24.4Slate blue · ΔE 27.5Blue violet · ΔE 31.1Medium blue · ΔE 34.5Dark orchid · ΔE 34.9
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 20.38, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFB615
Analogous#15D3FF, #4115FF
Triadic#FF155E, #5EFF15
Split complementary#FF4115, #D3FF15
Tetradic#FF15D3, #FFB615, #15FF41

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E1EAFF
Lighter +30%#AEC7FF
Lighter +20%#7BA4FF
Lighter +10%#4881FF
Darker −10%#0046E1
Darker −20%#0036AE
Darker −30%#00267B
Darker −40%#001648
More saturated +25%#155EFF
Less saturated −25%#3269E2

Channel breakdown

R21
G94
B255
Red21 (8.2%)
Green94 (36.9%)
Blue255 (100%)
Hue221.28°
Saturation (HSL)100%
Lightness54.12%
Dominant channelBlue
Hex per channelR 15 · G 5E · B FF

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