#643A51
Closest named color: Purple Brown (#673A3F). oklch(40.7% 0.068 346.5), rgb(100, 58, 81).
Aa
White text reads best on this color (9.26:1).
About this color
#643A51 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.068 and its hue 347°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.031 away. White text reads best on it, at 9.26:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.068) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #643A51 |
| RGB | rgb(100, 58, 81) |
| HSL | hsl(327, 27%, 31%) |
| OKLCH | oklch(40.7% 0.068 346.5) |
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 #643A51 | 9.26:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #643A51 | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #643A51 text on white | 9.26:1 | AAA | Lc 91.2 | Preferred for body text |
| #643A51 text on black | 2.26:1 | Fails | Lc -11.1 | 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
#F0E7EB
oklch(93.6% 0.011 348.4)
-
Step 200
200
#E5D4DC
oklch(88.6% 0.022 347.3)
-
Step 300
300
#D5B7C6
oklch(81% 0.04 346.4)
-
Step 400
400
#BF91A9
oklch(70.7% 0.064 346.2)
-
Step 500
500
#AE7593
oklch(63% 0.082 346.9)
-
Step 600
600
#995E7E
oklch(55.7% 0.088 346.6)
-
Step 700
700
#824D6A
oklch(49.1% 0.081 346.5)
-
Step 800
800 (this color)
#643A51
oklch(40.7% 0.068 346.5)
-
Step 900
900
#563647
oklch(37.7% 0.052 346.8)
-
Step 950
950
#33202A
oklch(27.1% 0.034 346.7)
#643A51 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) | #3D4352 | 0.072 |
| Deuteranopia (no green cones) | #484A50 | 0.066 |
| Tritanopia (no blue cones) | #693942 | 0.026 |
| Achromatopsia (no color) | #474747 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A51
#643A51
oklch(40.7% 0.068 346.5)
- #1D5541
#1D5541
oklch(40.6% 0.068 166.2)
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 #643A51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.031
- Brownish Purple #76424E ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.081
- Dark Mauve #874C62 ΔE 0.088
- Dusty Grape #545775 ΔE 0.088
- Velvet #750851 ΔE 0.090
- Grape Purple #5D1451 ΔE 0.090
- Red Purple #820747 ΔE 0.092
Use #643A51 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.