#640837
Closest named color: Merlot (#730039). oklch(33.3% 0.128 357), rgb(100, 8, 55).
Aa
White text reads best on this color (12.86:1).
About this color
#640837 is a dark, moderately saturated red. In OKLCH its lightness is 33%, its chroma 0.128 and its hue 357°. 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 12.86:1.
| Hue family | Reds |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.128) |
| Temperature | warm |
| Nearest name | Merlot (#730039) |
| Black text | 1.63:1 |
| White text | 12.86:1 |
Values
| HEX | #640837 |
| RGB | rgb(100, 8, 55) |
| HSL | hsl(329, 85%, 21%) |
| OKLCH | oklch(33.3% 0.128 357) |
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 #640837 | 12.86:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #640837 | 1.63:1 | Fails | Lc 0.0 | Not readable |
| #640837 text on white | 12.86:1 | AAA | Lc 97.5 | Preferred for body text |
| #640837 text on black | 1.63:1 | 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
#F8CBD9
oklch(88.5% 0.054 357.7)
-
Step 300
300
#F3A7C1
oklch(80.9% 0.095 357.3)
-
Step 400
400
#EA74A2
oklch(70.8% 0.153 357.1)
-
Step 500
500
#DF488B
oklch(63.1% 0.195 357)
-
Step 600
600
#CA1C75
oklch(55.6% 0.213 356.9)
-
Step 700
700
#AE0562
oklch(49% 0.198 357)
-
Step 800
800
#8E1050
oklch(42.8% 0.164 357.2)
-
Step 900
900 (this color)
#640837
oklch(33.3% 0.128 357)
-
Step 950
950
#431127
oklch(27% 0.081 356.8)
#640837 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) | #202738 | 0.145 |
| Deuteranopia (no green cones) | #383835 | 0.130 |
| Tritanopia (no blue cones) | #6D001F | 0.044 |
| Achromatopsia (no color) | #323232 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #640837
#640837
oklch(33.3% 0.128 357)
- #004035
#004035
oklch(33.2% 0.062 176.6)
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 #640837, 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 0.033
- Grape Purple #5D1451 ΔE 0.048
- Claret #680018 ΔE 0.049
- Bordeaux #7B002C ΔE 0.056
- Velvet #750851 ΔE 0.056
- Wine #80013F ΔE 0.063
- Wine Red #7B0323 ΔE 0.063
Use #640837 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.