#A3131F
Closest named color: Auburn (#9B2226). oklch(45.9% 0.175 24.7), rgb(163, 19, 31).
Aa
White text reads best on this color (7.86:1).
About this color
#A3131F is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.175 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Auburn (#9B2226), ΔE 0.019 away. White text reads best on it, at 7.86:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.175) |
| Temperature | warm |
| Nearest name | Auburn (#9B2226) |
| Black text | 2.67:1 |
| White text | 7.86:1 |
Values
| HEX | #A3131F |
| RGB | rgb(163, 19, 31) |
| HSL | hsl(355, 79%, 36%) |
| OKLCH | oklch(45.9% 0.175 24.7) |
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 #A3131F | 7.86:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #A3131F | 2.67:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #A3131F text on white | 7.86:1 | AAA | Lc 85.4 | Fine for body text |
| #A3131F text on black | 2.67:1 | Fails | Lc -16.7 | 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 800.
-
Step 50
50
#FFF2F1
oklch(97.1% 0.014 22.8)
-
Step 100
100
#FDE3E0
oklch(93.6% 0.029 25.6)
-
Step 200
200
#FDCBC7
oklch(88.5% 0.057 23.6)
-
Step 300
300
#FCA7A0
oklch(81% 0.102 24.7)
-
Step 400
400
#F6726C
oklch(70.8% 0.163 24.7)
-
Step 500
500
#ED4144
oklch(63.1% 0.208 24.7)
-
Step 600
600
#D80024
oklch(55.6% 0.225 24.8)
-
Step 700
700
#B7001D
oklch(49.1% 0.199 24.8)
-
Step 800
800 (this color)
#A3131F
oklch(45.9% 0.175 24.7)
-
Step 900
900
#7A1318
oklch(37.7% 0.137 24.8)
-
Step 950
950
#480F0F
oklch(27% 0.086 25.1)
#A3131F 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) | #453E1E | 0.193 |
| Deuteranopia (no green cones) | #675C18 | 0.175 |
| Tritanopia (no blue cones) | #B4001A | 0.034 |
| Achromatopsia (no color) | #525252 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A3131F
#A3131F
oklch(45.9% 0.175 24.7)
- #00646C
#00646C
oklch(45.9% 0.078 204.4)
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 #A3131F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Auburn #9B2226 ΔE 0.019
- Carmine #9D0216 ΔE 0.020
- Brown #A52A2A ΔE 0.027
- Burnt Red #9F2305 ΔE 0.028
- Deep Red #9A0200 ΔE 0.031
- Rufous #AE2012 ΔE 0.033
- Blood Red #980002 ΔE 0.034
- Rouge #AB1239 ΔE 0.035
Use #A3131F 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.