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Recognised as Colour

#EF373A

  • #EF373A
  • Red
  • Dark
  • Nearest: Crimson

#EF373A is a red with RGB values 239, 55, 58 and HSL 359°, 85%, 58%. It is a dark colour, so black text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#EF373A#EF373A
HEX#EF373A
RGBrgb(239, 55, 58)
RGB (0–1)0.9373, 0.2157, 0.2275
RGB percentages93.7%, 21.6%, 22.7%
HSLhsl(359, 85.2%, 57.6%)
HSV / HSBhsv(359, 77%, 93.7%)
CMYK0%, 77%, 75.7%, 6.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,677,242
CSS custom property--colour: #EF373A;

Brightness & contrast

Relative luminance0.21389WCAG 2.x, 0 is black and 1 is white
Perceived brightness138.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.28:1
Contrast with white3.98:1WCAG normal text: Fail
Contrast with black5.28:1WCAG normal text: AA
Greyscale equivalent#5E5E5E
Inverted#10C8C5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#706638no red cones; affects about 1% of men; ΔE 73.8 from the original
Deuteranopia#9E8E32no green cones; the most common form, about 1% of men; ΔE 73.9 from the original
Tritanopia#FF003Bno blue cones; rare, and affects men and women equally; ΔE 12.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.98:1WCAG large text: AA
Contrast with black, large text5.28:1WCAG large text: AAA

Named colours

Crimson · ΔE 11.5Tomato · ΔE 14.2Firebrick · ΔE 19.7Orange red · ΔE 26.4Red · ΔE 27Coral · ΔE 27.3
Nearest named CSS colourCrimson (#DC143C)ΔE 11.53, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#37EFEC
Analogous#EF3796, #EF9037
Triadic#3AEF37, #373AEF
Split complementary#37EF90, #3796EF
Tetradic#96EF37, #37EFEC, #9037EF

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FEF4F4
Lighter +30%#FAC5C6
Lighter +20%#F79597
Lighter +10%#F36669
Darker −10%#E11215
Darker −20%#B20E11
Darker −30%#830A0C
Darker −40%#530708
More saturated +25%#FF272B
Less saturated −25%#D45254

Channel breakdown

R239
G55
B58
Red239 (93.7%)
Green55 (21.6%)
Blue58 (22.7%)
Hue359.02°
Saturation (HSL)85.19%
Lightness57.65%
Dominant channelRed
Hex per channelR EF · G 37 · B 3A

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Every value on this page was computed from “ef373a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.