#643741
Closest named color: Purple Brown (#673A3F). oklch(39.6% 0.065 6.2), rgb(100, 55, 65).
Aa
White text reads best on this color (9.70:1).
About this color
#643741 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.065 and its hue 6°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.012 away. White text reads best on it, at 9.70:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.065) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.16:1 |
| White text | 9.70:1 |
Values
| HEX | #643741 |
| RGB | rgb(100, 55, 65) |
| HSL | hsl(347, 29%, 30%) |
| OKLCH | oklch(39.6% 0.065 6.2) |
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 #643741 | 9.70:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #643741 | 2.16:1 | Fails | Lc 11.7 | Not readable |
| #643741 text on white | 9.70:1 | AAA | Lc 92.3 | Preferred for body text |
| #643741 text on black | 2.16:1 | Fails | Lc -10.1 | 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 900.
-
Step 50
50
#FAF4F5
oklch(97.2% 0.007 5.6)
-
Step 100
100
#F3E6E8
oklch(93.6% 0.014 6.7)
-
Step 200
200
#EAD2D6
oklch(88.5% 0.027 6.2)
-
Step 300
300
#DEB4BC
oklch(80.9% 0.05 5.4)
-
Step 400
400
#CB8C99
oklch(70.6% 0.078 5.7)
-
Step 500
500
#BC6F80
oklch(63.1% 0.099 6.1)
-
Step 600
600
#A85669
oklch(55.7% 0.109 6.5)
-
Step 700
700
#8F4658
oklch(49.1% 0.1 5.9)
-
Step 800
800
#753A48
oklch(42.8% 0.084 6.2)
-
Step 900
900 (this color)
#643741
oklch(39.6% 0.065 6.2)
-
Step 950
950
#371E23
oklch(27% 0.04 7.1)
#643741 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) | #3E3F41 | 0.072 |
| Deuteranopia (no green cones) | #4A4740 | 0.065 |
| Tritanopia (no blue cones) | #6B333B | 0.017 |
| Achromatopsia (no color) | #444444 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643741
#643741
oklch(39.6% 0.065 6.2)
- #0C524C
#0C524C
oklch(39.7% 0.065 186)
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 #643741, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.012
- Brownish Purple #76424E ΔE 0.050
- Chestnut #742802 ΔE 0.074
- Charcoal Grey #3C4142 ΔE 0.076
- Wine Red #7B0323 ΔE 0.087
- Bordeaux #7B002C ΔE 0.087
- Onyx #343A40 ΔE 0.088
- Reddy Brown #6E1005 ΔE 0.089
Use #643741 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.