#643A40
Closest named color: Purple Brown (#673A3F). oklch(40.1% 0.06 10.9), rgb(100, 58, 64).
Aa
White text reads best on this color (9.45:1).
About this color
#643A40 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.060 and its hue 11°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.006 away. White text reads best on it, at 9.45:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.060) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.22:1 |
| White text | 9.45:1 |
Values
| HEX | #643A40 |
| RGB | rgb(100, 58, 64) |
| HSL | hsl(351, 27%, 31%) |
| OKLCH | oklch(40.1% 0.06 10.9) |
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 #643A40 | 9.45:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #643A40 | 2.22:1 | Fails | Lc 12.3 | Not readable |
| #643A40 text on white | 9.45:1 | AAA | Lc 91.7 | Preferred for body text |
| #643A40 text on black | 2.22:1 | Fails | Lc -10.7 | 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
#F9F4F4
oklch(97.1% 0.005 17.2)
-
Step 100
100
#F2E6E8
oklch(93.5% 0.013 5.8)
-
Step 200
200
#E9D3D5
oklch(88.5% 0.025 11.3)
-
Step 300
300
#DCB5B9
oklch(80.9% 0.045 11.2)
-
Step 400
400
#C98E96
oklch(70.7% 0.072 10.1)
-
Step 500
500
#BA727C
oklch(63.2% 0.092 11)
-
Step 600
600
#A55965
oklch(55.6% 0.1 10.8)
-
Step 700
700
#8D4954
oklch(49.2% 0.092 10.8)
-
Step 800
800
#733C45
oklch(42.8% 0.077 10.5)
-
Step 900
900 (this color)
#643A40
oklch(40.1% 0.06 10.9)
-
Step 950
950
#371E22
oklch(27% 0.039 9.7)
#643A40 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) | #414140 | 0.066 |
| Deuteranopia (no green cones) | #4C493F | 0.060 |
| Tritanopia (no blue cones) | #6B363C | 0.016 |
| Achromatopsia (no color) | #464646 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A40
#643A40
oklch(40.1% 0.06 10.9)
- #165250
#165250
oklch(40.1% 0.06 191.8)
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 #643A40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.006
- Brownish Purple #76424E ΔE 0.047
- Chestnut #742802 ΔE 0.073
- Charcoal Grey #3C4142 ΔE 0.073
- Mud Brown #60460F ΔE 0.081
- Red Brown #8B2E16 ΔE 0.088
- Onyx #343A40 ΔE 0.088
- Wine Red #7B0323 ΔE 0.092
Use #643A40 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.