#A1311B
Closest named color: Brick (#A03623). oklch(47.9% 0.152 33.1), rgb(161, 49, 27).
Aa
White text reads best on this color (7.06:1).
About this color
#A1311B is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.152 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Brick (#A03623), ΔE 0.009 away. White text reads best on it, at 7.06:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.152) |
| Temperature | warm |
| Nearest name | Brick (#A03623) |
| Black text | 2.97:1 |
| White text | 7.06:1 |
Values
| HEX | #A1311B |
| RGB | rgb(161, 49, 27) |
| HSL | hsl(10, 71%, 37%) |
| OKLCH | oklch(47.9% 0.152 33.1) |
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 #A1311B | 7.06:1 | AAA | Lc -88.4 | Fine for body text |
| Black text on #A1311B | 2.97:1 | Fails | Lc 20.6 | Dividers and decoration only |
| #A1311B text on white | 7.06:1 | AAA | Lc 83.4 | Fine for body text |
| #A1311B text on black | 2.97:1 | Fails | Lc -18.5 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F8E5E1
oklch(93.6% 0.022 31.8)
-
Step 200
200
#F3D0C8
oklch(88.5% 0.041 33)
-
Step 300
300
#ECB0A2
oklch(80.9% 0.073 33.5)
-
Step 400
400
#E08470
oklch(70.7% 0.118 33.1)
-
Step 500
500
#D4624A
oklch(63.1% 0.149 33.4)
-
Step 600
600
#C0442C
oklch(55.6% 0.164 33)
-
Step 700
700 (this color)
#A1311B
oklch(47.9% 0.152 33.1)
-
Step 800
800
#862D1C
oklch(42.7% 0.126 32.9)
-
Step 900
900
#6C2A1D
oklch(37.8% 0.097 32.9)
-
Step 950
950
#401911
oklch(27% 0.063 33.1)
#A1311B 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) | #524917 | 0.158 |
| Deuteranopia (no green cones) | #6E6215 | 0.144 |
| Tritanopia (no blue cones) | #B2072D | 0.056 |
| Achromatopsia (no color) | #585858 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A1311B
#A1311B
oklch(47.9% 0.152 33.1)
- #006979
#006979
oklch(47.8% 0.084 212.8)
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 #A1311B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brick #A03623 ΔE 0.009
- Rust Red #AA2704 ΔE 0.021
- Brown #A52A2A ΔE 0.022
- Russet #A13905 ΔE 0.022
- Burnt Red #9F2305 ΔE 0.023
- Rusty Red #AF2F0D ΔE 0.029
- Rufous #AE2012 ΔE 0.030
- Auburn #9B2226 ΔE 0.034
Use #A1311B 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.