#A3182D
Closest named color: Auburn (#9B2226). oklch(46.3% 0.171 20.4), rgb(163, 24, 45).
Aa
White text reads best on this color (7.70:1).
About this color
#A3182D is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.171 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Auburn (#9B2226), ΔE 0.021 away. White text reads best on it, at 7.70:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Auburn (#9B2226) |
| Black text | 2.72:1 |
| White text | 7.70:1 |
Values
| HEX | #A3182D |
| RGB | rgb(163, 24, 45) |
| HSL | hsl(351, 74%, 37%) |
| OKLCH | oklch(46.3% 0.171 20.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #A3182D | 7.70:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #A3182D | 2.72:1 | Fails | Lc 19.0 | Dividers and decoration only |
| #A3182D text on white | 7.70:1 | AAA | Lc 85.0 | Fine for body text |
| #A3182D text on black | 2.72:1 | Fails | Lc -17.0 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E3
oklch(93.6% 0.024 20.7)
-
Step 200
200
#F6CECC
oklch(88.5% 0.045 21.4)
-
Step 300
300
#F2ACAA
oklch(81% 0.083 20.9)
-
Step 400
400
#E77C7D
oklch(70.6% 0.132 20.4)
-
Step 500
500
#DD565D
oklch(63.2% 0.169 20.3)
-
Step 600
600
#C83443
oklch(55.6% 0.184 20.3)
-
Step 700
700 (this color)
#A3182D
oklch(46.3% 0.171 20.4)
-
Step 800
800
#8C212C
oklch(42.7% 0.142 20.3)
-
Step 900
900
#712228
oklch(37.7% 0.111 20)
-
Step 950
950
#421517
oklch(26.8% 0.07 20.5)
#A3182D with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #45402D | 0.190 |
| Deuteranopia (no green cones) | #675D28 | 0.173 |
| Tritanopia (no blue cones) | #B40022 | 0.035 |
| Achromatopsia (no color) | #535353 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A3182D
#A3182D
oklch(46.3% 0.171 20.4)
- #00666B
#00666B
oklch(46.4% 0.079 200.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #A3182D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Auburn #9B2226 ΔE 0.021
- Rouge #AB1239 ΔE 0.023
- Brown #A52A2A ΔE 0.026
- Carmine #9D0216 ΔE 0.029
- Cranberry #9E003A ΔE 0.033
- Rufous #AE2012 ΔE 0.039
- Burnt Red #9F2305 ΔE 0.039
- Firebrick #B22222 ΔE 0.040
Use #A3182D in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.