#643137
Closest named color: Purple Brown (#673A3F). oklch(38.2% 0.074 13.8), rgb(100, 49, 55).
Aa
White text reads best on this color (10.31:1).
About this color
#643137 is a dark, moderately saturated red. In OKLCH its lightness is 38%, its chroma 0.074 and its hue 14°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.025 away. White text reads best on it, at 10.31:1.
| Hue family | Reds |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.074) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.03:1 |
| White text | 10.31:1 |
Values
| HEX | #643137 |
| RGB | rgb(100, 49, 55) |
| HSL | hsl(353, 34%, 29%) |
| OKLCH | oklch(38.2% 0.074 13.8) |
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 #643137 | 10.31:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #643137 | 2.03:1 | Fails | Lc 10.3 | Not readable |
| #643137 text on white | 10.31:1 | AAA | Lc 93.6 | Preferred for body text |
| #643137 text on black | 2.03:1 | Fails | Lc -8.9 | 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
#FAF3F4
oklch(97% 0.008 7.3)
-
Step 100
100
#F4E6E7
oklch(93.6% 0.015 12.4)
-
Step 200
200
#EDD1D3
oklch(88.5% 0.031 12.8)
-
Step 300
300
#E2B3B6
oklch(81% 0.055 14.1)
-
Step 400
400
#D28A90
oklch(70.8% 0.088 14.1)
-
Step 500
500
#C46B75
oklch(63.1% 0.113 13.7)
-
Step 600
600
#AF515E
oklch(55.6% 0.123 13.4)
-
Step 700
700
#96414D
oklch(49.1% 0.115 13.6)
-
Step 800
800
#7A363F
oklch(42.7% 0.095 13.8)
-
Step 900
900 (this color)
#643137
oklch(38.2% 0.074 13.8)
-
Step 950
950
#3A1C20
oklch(27% 0.047 12.2)
#643137 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) | #3B3A37 | 0.080 |
| Deuteranopia (no green cones) | #484436 | 0.073 |
| Tritanopia (no blue cones) | #6C2B33 | 0.019 |
| Achromatopsia (no color) | #404040 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643137
#643137
oklch(38.2% 0.074 13.8)
- #004E4D
#004E4D
oklch(38.3% 0.066 193.3)
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 #643137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.025
- Chestnut #742802 ΔE 0.061
- Brownish Purple #76424E ΔE 0.064
- Reddy Brown #6E1005 ΔE 0.071
- Wine Red #7B0323 ΔE 0.074
- Bordeaux #7B002C ΔE 0.076
- Merlot #730039 ΔE 0.079
- Claret #680018 ΔE 0.080
Use #643137 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.