#643E51
Closest named color: Purple Brown (#673A3F). oklch(41.5% 0.06 348.6), rgb(100, 62, 81).
Aa
White text reads best on this color (8.93:1).
About this color
#643E51 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.060 and its hue 349°. 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 8.93:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.060) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.34:1 |
| White text | 8.93:1 |
Values
| HEX | #643E51 |
| RGB | rgb(100, 62, 81) |
| HSL | hsl(330, 23%, 32%) |
| OKLCH | oklch(41.5% 0.06 348.6) |
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 #643E51 | 8.93:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #643E51 | 2.34:1 | Fails | Lc 13.6 | Not readable |
| #643E51 text on white | 8.93:1 | AAA | Lc 90.4 | Preferred for body text |
| #643E51 text on black | 2.34:1 | Fails | Lc -11.9 | 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
#F8F4F6
oklch(97.1% 0.005 345.3)
-
Step 100
100
#EFE7EB
oklch(93.5% 0.01 345.4)
-
Step 200
200
#E4D4DB
oklch(88.5% 0.02 349.1)
-
Step 300
300
#D3B8C4
oklch(80.9% 0.035 349.3)
-
Step 400
400
#BC93A6
oklch(70.7% 0.055 349.1)
-
Step 500
500
#AB7891
oklch(63.2% 0.072 348.5)
-
Step 600
600
#95607B
oklch(55.5% 0.078 348)
-
Step 700
700
#7F4F67
oklch(49% 0.072 348.7)
-
Step 800
800 (this color)
#643E51
oklch(41.5% 0.06 348.6)
-
Step 900
900
#543746
oklch(37.6% 0.047 347.2)
-
Step 950
950
#312129
oklch(27% 0.028 347.7)
#643E51 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) | #414652 | 0.064 |
| Deuteranopia (no green cones) | #4B4C50 | 0.058 |
| Tritanopia (no blue cones) | #693D45 | 0.021 |
| Achromatopsia (no color) | #494949 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643E51
#643E51
oklch(41.5% 0.06 348.6)
- #265646
#265646
oklch(41.4% 0.059 169.1)
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 #643E51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.028
- Brownish Purple #76424E ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.078
- Dusty Grape #545775 ΔE 0.080
- Dark Mauve #874C62 ΔE 0.082
- Dusk #4E5481 ΔE 0.091
- Onyx #343A40 ΔE 0.094
- Dark Grey Blue #29465B ΔE 0.095
Use #643E51 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.