#643131
Closest named color: Purple Brown (#673A3F). oklch(38% 0.074 21.1), rgb(100, 49, 49).
Aa
White text reads best on this color (10.36:1).
About this color
#643131 is a dark, moderately saturated red. In OKLCH its lightness is 38%, its chroma 0.074 and its hue 21°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.028 away. White text reads best on it, at 10.36:1.
| Hue family | Reds |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.074) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.02:1 |
| White text | 10.36:1 |
Values
| HEX | #643131 |
| RGB | rgb(100, 49, 49) |
| HSL | hsl(0, 34%, 29%) |
| OKLCH | oklch(38% 0.074 21.1) |
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 #643131 | 10.36:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #643131 | 2.02:1 | Fails | Lc 10.2 | Not readable |
| #643131 text on white | 10.36:1 | AAA | Lc 93.8 | Preferred for body text |
| #643131 text on black | 2.02:1 | Fails | Lc -8.8 | 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 900.
-
Step 50
50
#FAF4F3
oklch(97.2% 0.007 28.8)
-
Step 100
100
#F4E6E5
oklch(93.6% 0.015 22.4)
-
Step 200
200
#EDD2D0
oklch(88.6% 0.03 22.8)
-
Step 300
300
#E2B3B1
oklch(80.8% 0.055 21.2)
-
Step 400
400
#D28A89
oklch(70.6% 0.089 20.4)
-
Step 500
500
#C56C6B
oklch(63.2% 0.113 21.4)
-
Step 600
600
#B05253
oklch(55.6% 0.123 21.2)
-
Step 700
700
#974244
oklch(49.1% 0.115 20.8)
-
Step 800
800
#7A3738
oklch(42.6% 0.094 20.9)
-
Step 900
900 (this color)
#643131
oklch(38% 0.074 21.1)
-
Step 950
950
#3A1D1C
oklch(27% 0.046 22.6)
#643131 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) | #3C3A31 | 0.079 |
| Deuteranopia (no green cones) | #494430 | 0.072 |
| Tritanopia (no blue cones) | #6D2A31 | 0.023 |
| Achromatopsia (no color) | #404040 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643131
#643131
oklch(38% 0.074 21.1)
- #004C51
#004C51
oklch(37.9% 0.065 202.4)
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 #643131, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.028
- Chestnut #742802 ΔE 0.054
- Reddy Brown #6E1005 ΔE 0.066
- Brownish Purple #76424E ΔE 0.068
- Wine Red #7B0323 ΔE 0.074
- Bordeaux #7B002C ΔE 0.078
- Blood #770001 ΔE 0.078
- Claret #680018 ΔE 0.078
Use #643131 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.