#643D45
Closest named color: Purple Brown (#673A3F). oklch(40.9% 0.056 6.5), rgb(100, 61, 69).
Aa
White text reads best on this color (9.14:1).
About this color
#643D45 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.056 and its hue 6°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.011 away. White text reads best on it, at 9.14:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.056) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.29:1 |
| White text | 9.14:1 |
Values
| HEX | #643D45 |
| RGB | rgb(100, 61, 69) |
| HSL | hsl(348, 24%, 32%) |
| OKLCH | oklch(40.9% 0.056 6.5) |
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 #643D45 | 9.14:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #643D45 | 2.29:1 | Fails | Lc 13.0 | Not readable |
| #643D45 text on white | 9.14:1 | AAA | Lc 90.9 | Preferred for body text |
| #643D45 text on black | 2.29:1 | Fails | Lc -11.4 | 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
#F0E7E9
oklch(93.6% 0.01 2)
-
Step 200
200
#E5D4D7
oklch(88.5% 0.019 5.3)
-
Step 300
300
#D4B8BD
oklch(80.8% 0.033 5.7)
-
Step 400
400
#BE949B
oklch(70.8% 0.051 7.3)
-
Step 500
500
#AD7983
oklch(63.2% 0.066 6.5)
-
Step 600
600
#98616C
oklch(55.6% 0.073 6.7)
-
Step 700
700
#82505A
oklch(49.1% 0.068 6.9)
-
Step 800
800 (this color)
#643D45
oklch(40.9% 0.056 6.5)
-
Step 900
900
#56383E
oklch(37.8% 0.044 6.2)
-
Step 950
950
#322124
oklch(27% 0.027 7.3)
#643D45 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) | #434445 | 0.061 |
| Deuteranopia (no green cones) | #4D4B44 | 0.057 |
| Tritanopia (no blue cones) | #6B3A40 | 0.015 |
| Achromatopsia (no color) | #484848 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D45
#643D45
oklch(40.9% 0.056 6.5)
- #20544F
#20544F
oklch(40.9% 0.056 186.6)
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 #643D45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.011
- Brownish Purple #76424E ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.073
- Chestnut #742802 ΔE 0.080
- Mud Brown #60460F ΔE 0.083
- Onyx #343A40 ΔE 0.090
- Dark Mauve #874C62 ΔE 0.090
- Red Brown #8B2E16 ΔE 0.091
Use #643D45 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.