#A3631B
Closest named color: Raw Umber (#A75E09). oklch(55.9% 0.116 63.3), rgb(163, 99, 27).
Aa
White text reads best on this color (4.81:1).
About this color
#A3631B is a medium-dark, moderately saturated brown. In OKLCH its lightness is 56%, its chroma 0.116 and its hue 63°. Its hue sits on the warm side of the wheel. The nearest named color is Raw Umber (#A75E09), ΔE 0.013 away. White text reads best on it, at 4.81:1.
| Hue family | Browns |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.116) |
| Temperature | warm |
| Nearest name | Raw Umber (#A75E09) |
| Black text | 4.35:1 |
| White text | 4.81:1 |
Values
| HEX | #A3631B |
| RGB | rgb(163, 99, 27) |
| HSL | hsl(32, 72%, 37%) |
| OKLCH | oklch(55.9% 0.116 63.3) |
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 #A3631B | 4.81:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #A3631B | 4.35:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #A3631B text on white | 4.81:1 | AA | Lc 73.1 | Content text, not long reading |
| #A3631B text on black | 4.35:1 | AA large text | Lc -28.6 | 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 600.
-
Step 50
50
#F9F4F1
oklch(97% 0.007 53.4)
-
Step 100
100
#F1E8E0
oklch(93.6% 0.015 64.3)
-
Step 200
200
#E7D5C6
oklch(88.4% 0.029 62.3)
-
Step 300
300
#D9BA9E
oklch(80.9% 0.052 64.1)
-
Step 400
400
#C69569
oklch(70.6% 0.084 62.7)
-
Step 500
500
#B77A3F
oklch(63.1% 0.107 62.8)
-
Step 600
600 (this color)
#A3631B
oklch(55.9% 0.116 63.3)
-
Step 700
700
#8B5109
oklch(49.2% 0.108 63.2)
-
Step 800
800
#71430E
oklch(42.9% 0.09 63.6)
-
Step 900
900
#5B3915
oklch(37.8% 0.069 64.2)
-
Step 950
950
#36210E
oklch(27% 0.044 61.2)
#A3631B 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) | #77690D | 0.081 |
| Deuteranopia (no green cones) | #86781C | 0.072 |
| Tritanopia (no blue cones) | #B35455 | 0.087 |
| Achromatopsia (no color) | #727272 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A3631B
#A3631B
oklch(55.9% 0.116 63.3)
- #297AB3
#297AB3
oklch(55.8% 0.117 243.8)
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 #A3631B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Raw Umber #A75E09 ΔE 0.013
- Raw Sienna #9A6200 ΔE 0.021
- Orangey Brown #B16002 ΔE 0.025
- Umber #B26400 ΔE 0.029
- Sepia #985E2B ΔE 0.029
- Earth #A2653E ΔE 0.029
- Copper #B66325 ΔE 0.037
- Caramel #AF6F09 ΔE 0.041
Use #A3631B 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.