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Recognised as Colour

#155FF3

  • #155FF3
  • Blue
  • Dark
  • Nearest: Medium slateblue

#155FF3 is a blue with RGB values 21, 95, 243 and HSL 220°, 90%, 52%. It is a dark colour, so white text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Medium slateblue.

Colour values

#155FF3#155FF3
HEX#155FF3
RGBrgb(21, 95, 243)
RGB (0–1)0.0824, 0.3725, 0.9529
RGB percentages8.2%, 37.3%, 95.3%
HSLhsl(220, 90.2%, 51.8%)
HSV / HSBhsv(220, 91.4%, 95.3%)
CMYK91.4%, 60.9%, 0%, 4.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,400,819
CSS custom property--colour: #155FF3;

Brightness & contrast

Relative luminance0.14815WCAG 2.x, 0 is black and 1 is white
Perceived brightness110.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.3:1
Contrast with white5.3:1WCAG normal text: AA
Contrast with black3.96:1WCAG normal text: Fail
Greyscale equivalent#5A5A5A
Inverted#EAA00C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0076F8no red cones; affects about 1% of men; ΔE 16.3 from the original
Deuteranopia#0062F0no green cones; the most common form, about 1% of men; ΔE 4.2 from the original
Tritanopia#0086A0no blue cones; rare, and affects men and women equally; ΔE 80.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.3:1WCAG large text: AAA
Contrast with black, large text3.96:1WCAG large text: AA

Named colours

Medium slateblue · ΔE 16.5Royal blue · ΔE 17.2Slate blue · ΔE 21.7Medium purple · ΔE 30.9Dodgerblue · ΔE 33.4Blue violet · ΔE 34.7
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 16.51, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#F3A915
Analogous#15CEF3, #3A15F3
Triadic#F3155F, #5FF315
Split complementary#F33A15, #CEF315
Tetradic#F315CE, #F3A915, #15F33A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D7E4FD
Lighter +30%#A7C3FA
Lighter +20%#76A1F8
Lighter +10%#4680F5
Darker −10%#0A4ACB
Darker −20%#08399A
Darker −30%#05276A
Darker −40%#031539
More saturated +25%#095BFF
Less saturated −25%#3469D4

Channel breakdown

R21
G95
B243
Red21 (8.2%)
Green95 (37.3%)
Blue243 (95.3%)
Hue220°
Saturation (HSL)90.24%
Lightness51.76%
Dominant channelBlue
Hex per channelR 15 · G 5F · B F3

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Every value on this page was computed from “155ff3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.