#643F3F
Closest named color: Purple Brown (#673A3F). oklch(41.1% 0.052 19.5), rgb(100, 63, 63).
Aa
White text reads best on this color (9.03:1).
About this color
#643F3F is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.052 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.015 away. White text reads best on it, at 9.03:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.052) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.32:1 |
| White text | 9.03:1 |
Values
| HEX | #643F3F |
| RGB | rgb(100, 63, 63) |
| HSL | hsl(0, 23%, 32%) |
| OKLCH | oklch(41.1% 0.052 19.5) |
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 #643F3F | 9.03:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #643F3F | 2.32:1 | Fails | Lc 13.3 | Not readable |
| #643F3F text on white | 9.03:1 | AAA | Lc 90.6 | Preferred for body text |
| #643F3F text on black | 2.32:1 | Fails | Lc -11.7 | 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 800.
-
Step 50
50
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E8E7
oklch(93.7% 0.009 26)
-
Step 200
200
#E4D5D4
oklch(88.5% 0.017 22.1)
-
Step 300
300
#D4B9B9
oklch(80.9% 0.031 17.8)
-
Step 400
400
#BD9594
oklch(70.7% 0.048 20)
-
Step 500
500
#AC7B7A
oklch(63.2% 0.062 20.3)
-
Step 600
600
#976363
oklch(55.5% 0.068 19.4)
-
Step 700
700
#815252
oklch(49.1% 0.063 19.6)
-
Step 800
800 (this color)
#643F3F
oklch(41.1% 0.052 19.5)
-
Step 900
900
#553939
oklch(37.7% 0.04 19.1)
-
Step 950
950
#322121
oklch(26.9% 0.026 18.9)
#643F3F 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) | #46443F | 0.055 |
| Deuteranopia (no green cones) | #4F4C3E | 0.052 |
| Tritanopia (no blue cones) | #6B3B3F | 0.016 |
| Achromatopsia (no color) | #494949 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F3F
#643F3F
oklch(41.1% 0.052 19.5)
- #235355
#235355
oklch(41% 0.052 199)
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 #643F3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.015
- Brownish Purple #76424E ΔE 0.043
- Mud Brown #60460F ΔE 0.070
- Charcoal Grey #3C4142 ΔE 0.071
- Chestnut #742802 ΔE 0.074
- Red Brown #8B2E16 ΔE 0.086
- Milk Chocolate #7F4E1E ΔE 0.087
- Onyx #343A40 ΔE 0.090
Use #643F3F 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.