#643975
Closest named color: Dark Slate Blue (#483D8B). oklch(42.3% 0.107 315.7), rgb(100, 57, 117).
Aa
White text reads best on this color (8.80:1).
About this color
#643975 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.107 and its hue 316°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.062 away. White text reads best on it, at 8.80:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.107) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.38:1 |
| White text | 8.80:1 |
Values
| HEX | #643975 |
| RGB | rgb(100, 57, 117) |
| HSL | hsl(283, 34%, 34%) |
| OKLCH | oklch(42.3% 0.107 315.7) |
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 #643975 | 8.80:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #643975 | 2.38:1 | Fails | Lc 14.1 | Not readable |
| #643975 text on white | 8.80:1 | AAA | Lc 89.9 | Fine for body text |
| #643975 text on black | 2.38:1 | Fails | Lc -12.4 | 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
#EFE6F2
oklch(93.5% 0.019 317.7)
-
Step 200
200
#E2D3E9
oklch(88.6% 0.034 315.2)
-
Step 300
300
#D1B5DD
oklch(81% 0.063 315.7)
-
Step 400
400
#B98DCB
oklch(70.7% 0.1 315.9)
-
Step 500
500
#A770BE
oklch(63.2% 0.128 315.4)
-
Step 600
600
#9256AA
oklch(55.5% 0.14 315.6)
-
Step 700
700
#7C4692
oklch(49.1% 0.13 315.4)
-
Step 800
800 (this color)
#643975
oklch(42.3% 0.107 315.7)
-
Step 900
900
#52325F
oklch(37.6% 0.084 315.6)
-
Step 950
950
#301E38
oklch(27% 0.053 314.9)
#643975 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) | #2D4877 | 0.093 |
| Deuteranopia (no green cones) | #394C73 | 0.084 |
| Tritanopia (no blue cones) | #634251 | 0.072 |
| Achromatopsia (no color) | #4A4A4A | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643975
#643975
oklch(42.3% 0.107 315.7)
- #315A17
#315A17
oklch(42.2% 0.106 135.7)
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 #643975, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.062
- Rebecca Purple #663399 ΔE 0.063
- Twilight #4E518B ΔE 0.073
- Blueberry #464196 ΔE 0.076
- Dusk #4E5481 ΔE 0.077
- Light Eggplant #894585 ΔE 0.083
- Brownish Purple #76424E ΔE 0.085
- Dusty Grape #545775 ΔE 0.085
Use #643975 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.