#643970
Closest named color: Dark Slate Blue (#483D8B). oklch(42% 0.101 318.6), rgb(100, 57, 112).
Aa
White text reads best on this color (8.89:1).
About this color
#643970 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.101 and its hue 319°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.068 away. White text reads best on it, at 8.89:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.101) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.36:1 |
| White text | 8.89:1 |
Values
| HEX | #643970 |
| RGB | rgb(100, 57, 112) |
| HSL | hsl(287, 33%, 33%) |
| OKLCH | oklch(42% 0.101 318.6) |
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 #643970 | 8.89:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #643970 | 2.36:1 | Fails | Lc 13.8 | Not readable |
| #643970 text on white | 8.89:1 | AAA | Lc 90.1 | Preferred for body text |
| #643970 text on black | 2.36:1 | Fails | Lc -12.1 | 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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#EFE6F1
oklch(93.5% 0.018 320.1)
-
Step 200
200
#E3D3E7
oklch(88.6% 0.032 319.5)
-
Step 300
300
#D1B5D9
oklch(80.8% 0.058 318.7)
-
Step 400
400
#BA8EC7
oklch(70.8% 0.095 318.4)
-
Step 500
500
#A870B8
oklch(63% 0.121 318.5)
-
Step 600
600
#9357A4
oklch(55.5% 0.132 318.5)
-
Step 700
700
#7D478C
oklch(49% 0.122 318.6)
-
Step 800
800 (this color)
#643970
oklch(42% 0.101 318.6)
-
Step 900
900
#53335C
oklch(37.7% 0.078 318.6)
-
Step 950
950
#311E36
oklch(27% 0.05 319.1)
#643970 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) | #304772 | 0.090 |
| Deuteranopia (no green cones) | #3C4B6E | 0.080 |
| Tritanopia (no blue cones) | #64404F | 0.064 |
| Achromatopsia (no color) | #4A4A4A | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643970
#643970
oklch(42% 0.101 318.6)
- #2E5A1F
#2E5A1F
oklch(42.1% 0.101 138.6)
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 #643970, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.068
- Rebecca Purple #663399 ΔE 0.071
- Twilight #4E518B ΔE 0.076
- Dusk #4E5481 ΔE 0.078
- Brownish Purple #76424E ΔE 0.078
- Blueberry #464196 ΔE 0.082
- Dusty Grape #545775 ΔE 0.084
- Purple Brown #673A3F ΔE 0.084
Use #643970 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.