#640D37
Closest named color: Merlot (#730039). oklch(33.6% 0.124 357.7), rgb(100, 13, 55).
Aa
White text reads best on this color (12.69:1).
About this color
#640D37 is a dark, moderately saturated red. In OKLCH its lightness is 34%, its chroma 0.124 and its hue 358°. Its hue sits on the warm side of the wheel. The nearest named color is Merlot (#730039), ΔE 0.033 away. White text reads best on it, at 12.69:1.
| Hue family | Reds |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.124) |
| Temperature | warm |
| Nearest name | Merlot (#730039) |
| Black text | 1.65:1 |
| White text | 12.69:1 |
Values
| HEX | #640D37 |
| RGB | rgb(100, 13, 55) |
| HSL | hsl(331, 77%, 22%) |
| OKLCH | oklch(33.6% 0.124 357.7) |
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 #640D37 | 12.69:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #640D37 | 1.65:1 | Fails | Lc 0.0 | Not readable |
| #640D37 text on white | 12.69:1 | AAA | Lc 97.4 | Preferred for body text |
| #640D37 text on black | 1.65:1 | Fails | Lc 0.0 | 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
#FDF2F5
oklch(97.1% 0.012 358.8)
-
Step 100
100
#FAE3EA
oklch(93.6% 0.027 357.2)
-
Step 200
200
#F7CCD9
oklch(88.6% 0.051 358.1)
-
Step 300
300
#F2A8C1
oklch(80.9% 0.092 357.4)
-
Step 400
400
#E875A1
oklch(70.7% 0.149 357.4)
-
Step 500
500
#DD4B8A
oklch(63.1% 0.19 357.4)
-
Step 600
600
#C82373
oklch(55.5% 0.206 357.8)
-
Step 700
700
#AD1161
oklch(49.2% 0.192 357.7)
-
Step 800
800
#8C154F
oklch(42.7% 0.158 357.6)
-
Step 900
900 (this color)
#640D37
oklch(33.6% 0.124 357.7)
-
Step 950
950
#431226
oklch(27.1% 0.079 358.5)
#640D37 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) | #222838 | 0.140 |
| Deuteranopia (no green cones) | #393835 | 0.124 |
| Tritanopia (no blue cones) | #6D0021 | 0.040 |
| Achromatopsia (no color) | #333333 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #640D37
#640D37
oklch(33.6% 0.124 357.7)
- #004137
#004137
oklch(33.6% 0.062 178.3)
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 #640D37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Merlot #730039 ΔE 0.033
- Burgundy #610023 ΔE 0.034
- Claret #680018 ΔE 0.048
- Grape Purple #5D1451 ΔE 0.048
- Bordeaux #7B002C ΔE 0.054
- Velvet #750851 ΔE 0.057
- Wine Red #7B0323 ΔE 0.061
- Wine #80013F ΔE 0.062
Use #640D37 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.