#643F43
Closest named color: Purple Brown (#673A3F). oklch(41.2% 0.052 12.5), rgb(100, 63, 67).
Aa
White text reads best on this color (8.99:1).
About this color
#643F43 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.052 and its hue 13°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.014 away. White text reads best on it, at 8.99:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.052) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #643F43 |
| RGB | rgb(100, 63, 67) |
| HSL | hsl(354, 23%, 32%) |
| OKLCH | oklch(41.2% 0.052 12.5) |
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 #643F43 | 8.99:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #643F43 | 2.33:1 | Fails | Lc 13.4 | Not readable |
| #643F43 text on white | 8.99:1 | AAA | Lc 90.5 | Preferred for body text |
| #643F43 text on black | 2.33:1 | Fails | Lc -11.8 | 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 800.
-
Step 50
50
#F8F4F5
oklch(97.1% 0.004 360)
-
Step 100
100
#F0E8E8
oklch(93.7% 0.009 17.3)
-
Step 200
200
#E4D5D6
oklch(88.5% 0.017 12.8)
-
Step 300
300
#D4B9BB
oklch(80.9% 0.031 12.7)
-
Step 400
400
#BD9598
oklch(70.8% 0.048 13.3)
-
Step 500
500
#AC7A7F
oklch(63.1% 0.063 12.4)
-
Step 600
600
#976368
oklch(55.7% 0.068 13.2)
-
Step 700
700
#805257
oklch(49.1% 0.062 12.5)
-
Step 800
800 (this color)
#643F43
oklch(41.2% 0.052 12.5)
-
Step 900
900
#55393C
oklch(37.8% 0.04 12.1)
-
Step 950
950
#322123
oklch(27% 0.026 11.2)
#643F43 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) | #454543 | 0.057 |
| Deuteranopia (no green cones) | #4E4C42 | 0.053 |
| Tritanopia (no blue cones) | #6B3C40 | 0.015 |
| Achromatopsia (no color) | #494949 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F43
#643F43
oklch(41.2% 0.052 12.5)
- #245452
#245452
oklch(41.2% 0.052 191.7)
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 #643F43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.014
- Brownish Purple #76424E ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.072
- Mud Brown #60460F ΔE 0.076
- Chestnut #742802 ΔE 0.079
- Dark Mauve #874C62 ΔE 0.089
- Red Brown #8B2E16 ΔE 0.089
- Onyx #343A40 ΔE 0.090
Use #643F43 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.