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Recognised as Colour

#213B57

  • #213B57
  • Blue
  • Dark
  • Nearest: Dark slate grey

#213B57 is a blue with RGB values 33, 59, 87 and HSL 211°, 45%, 24%. It is a dark colour, so white text on it reaches 11.5:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#213B57#213B57
HEX#213B57
RGBrgb(33, 59, 87)
RGB (0–1)0.1294, 0.2314, 0.3412
RGB percentages12.9%, 23.1%, 34.1%
HSLhsl(211.1, 45%, 23.5%)
HSV / HSBhsv(211.1, 62.1%, 34.1%)
CMYK62.1%, 32.2%, 0%, 65.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,177,879
CSS custom property--colour: #213B57;

Brightness & contrast

Relative luminance0.04139WCAG 2.x, 0 is black and 1 is white
Perceived brightness56.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.49:1
Contrast with white11.49:1WCAG normal text: AAA
Contrast with black1.83:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#DEC4A8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2F3C58no red cones; affects about 1% of men; ΔE 4 from the original
Deuteranopia#283756no green cones; the most common form, about 1% of men; ΔE 4.4 from the original
Tritanopia#004145no blue cones; rare, and affects men and women equally; ΔE 20.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.49:1WCAG large text: AAA
Contrast with black, large text1.83:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 21Dim grey · ΔE 28.4Slate grey · ΔE 30.2Steel blue · ΔE 31.1Black · ΔE 31.2Light slate grey · ΔE 33
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 20.99, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#573D21
Analogous#215657, #222157
Triadic#57213B, #3B5721
Split complementary#572221, #565721
Tetradic#572156, #573D21, #215722

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#78A0CC
Lighter +30%#5387BE
Lighter +20%#3D6DA1
Lighter +10%#2F547C
Darker −10%#132232
Darker −20%#05090D
Darker −30%#000000
Darker −40%#000000
More saturated +25%#123A66
Less saturated −25%#303C48

Channel breakdown

R33
G59
B87
Red33 (12.9%)
Green59 (23.1%)
Blue87 (34.1%)
Hue211.11°
Saturation (HSL)45%
Lightness23.53%
Dominant channelBlue
Hex per channelR 21 · G 3B · B 57

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Every value on this page was computed from “213b57” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.