#643C40
Closest named color: Purple Brown (#673A3F). oklch(40.5% 0.057 13.4), rgb(100, 60, 64).
Aa
White text reads best on this color (9.28:1).
About this color
#643C40 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.057 and its hue 13°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.007 away. White text reads best on it, at 9.28:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.057) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.26:1 |
| White text | 9.28:1 |
Values
| HEX | #643C40 |
| RGB | rgb(100, 60, 64) |
| HSL | hsl(354, 25%, 31%) |
| OKLCH | oklch(40.5% 0.057 13.4) |
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 #643C40 | 9.28:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #643C40 | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #643C40 text on white | 9.28:1 | AAA | Lc 91.3 | Preferred for body text |
| #643C40 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
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E7E8
oklch(93.5% 0.01 9.5)
-
Step 200
200
#E5D4D5
oklch(88.4% 0.019 13.4)
-
Step 300
300
#D5B8BA
oklch(80.8% 0.033 13.1)
-
Step 400
400
#BF9497
oklch(70.8% 0.052 13.8)
-
Step 500
500
#AE797D
oklch(63.1% 0.067 14.2)
-
Step 600
600
#996167
oklch(55.5% 0.073 12.7)
-
Step 700
700
#835055
oklch(49.1% 0.069 13.5)
-
Step 800
800 (this color)
#643C40
oklch(40.5% 0.057 13.4)
-
Step 900
900
#57383B
oklch(37.8% 0.045 13)
-
Step 950
950
#332122
oklch(27.1% 0.028 15.4)
#643C40 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) | #434240 | 0.061 |
| Deuteranopia (no green cones) | #4D4A3F | 0.057 |
| Tritanopia (no blue cones) | #6B383E | 0.016 |
| Achromatopsia (no color) | #474747 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C40
#643C40
oklch(40.5% 0.057 13.4)
- #1C5352
#1C5352
oklch(40.6% 0.057 193.5)
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 #643C40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.007
- Brownish Purple #76424E ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.072
- Chestnut #742802 ΔE 0.073
- Mud Brown #60460F ΔE 0.077
- Red Brown #8B2E16 ΔE 0.087
- Onyx #343A40 ΔE 0.089
- Rust Brown #8B3103 ΔE 0.093
Use #643C40 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.