#831D21
Closest named color: Dark Red (#8B0000). oklch(40.4% 0.137 24), rgb(131, 29, 33).
Aa
White text reads best on this color (9.70:1).
About this color
#831D21 is a dark, moderately saturated red. In OKLCH its lightness is 40%, its chroma 0.137 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Red (#8B0000), ΔE 0.031 away. White text reads best on it, at 9.70:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.137) |
| Temperature | warm |
| Nearest name | Dark Red (#8B0000) |
| Black text | 2.16:1 |
| White text | 9.70:1 |
Values
| HEX | #831D21 |
| RGB | rgb(131, 29, 33) |
| HSL | hsl(358, 64%, 31%) |
| OKLCH | oklch(40.4% 0.137 24) |
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 #831D21 | 9.70:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #831D21 | 2.16:1 | Fails | Lc 12.7 | Not readable |
| #831D21 text on white | 9.70:1 | AAA | Lc 91.2 | Preferred for body text |
| #831D21 text on black | 2.16:1 | Fails | Lc -11.1 | Not readable |
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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#F9E4E2
oklch(93.5% 0.023 24.1)
-
Step 200
200
#F5CECB
oklch(88.4% 0.044 23.2)
-
Step 300
300
#F0ADA8
oklch(80.9% 0.08 23.8)
-
Step 400
400
#E57E79
oklch(70.6% 0.128 23.7)
-
Step 500
500
#DB5957
oklch(63.1% 0.164 23.9)
-
Step 600
600
#C6393C
oklch(55.6% 0.178 24)
-
Step 700
700
#AB2A2E
oklch(49.2% 0.165 24.3)
-
Step 800
800 (this color)
#831D21
oklch(40.4% 0.137 24)
-
Step 900
900
#6F2424
oklch(37.5% 0.107 23.8)
-
Step 950
950
#421716
oklch(27.1% 0.067 23.9)
#831D21 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) | #3B3620 | 0.149 |
| Deuteranopia (no green cones) | #554C1D | 0.136 |
| Tritanopia (no blue cones) | #910020 | 0.033 |
| Achromatopsia (no color) | #444444 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #831D21
#831D21
oklch(40.4% 0.137 24)
- #00535A
#00535A
oklch(40.3% 0.069 204.7)
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 #831D21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Red #8B0000 ΔE 0.031
- Brick Red #8F1402 ΔE 0.032
- Maroon #800000 ΔE 0.035
- Wine Red #7B0323 ΔE 0.038
- Red Brown #8B2E16 ΔE 0.042
- Red Wine #8C0034 ΔE 0.044
- Blood Red #980002 ΔE 0.046
- Bordeaux #7B002C ΔE 0.047
Use #831D21 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.