#643D74
Closest named color: Dark Slate Blue (#483D8B). oklch(42.9% 0.098 315.5), rgb(100, 61, 116).
Aa
White text reads best on this color (8.53:1).
About this color
#643D74 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.098 and its hue 315°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.064 away. White text reads best on it, at 8.53:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.098) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.46:1 |
| White text | 8.53:1 |
Values
| HEX | #643D74 |
| RGB | rgb(100, 61, 116) |
| HSL | hsl(283, 31%, 35%) |
| OKLCH | oklch(42.9% 0.098 315.5) |
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 #643D74 | 8.53:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #643D74 | 2.46:1 | Fails | Lc 14.8 | Not readable |
| #643D74 text on white | 8.53:1 | AAA | Lc 89.1 | Fine for body text |
| #643D74 text on black | 2.46:1 | Fails | Lc -13.1 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EEE7F2
oklch(93.7% 0.016 313.6)
-
Step 200
200
#E1D3E8
oklch(88.4% 0.032 314.7)
-
Step 300
300
#CFB6DA
oklch(80.9% 0.057 315.6)
-
Step 400
400
#B78FC8
oklch(70.7% 0.092 315.6)
-
Step 500
500
#A572BA
oklch(63.1% 0.119 315.7)
-
Step 600
600
#905AA6
oklch(55.7% 0.128 315.6)
-
Step 700
700
#7A498E
oklch(49.1% 0.119 315.5)
-
Step 800
800 (this color)
#643D74
oklch(42.9% 0.098 315.5)
-
Step 900
900
#51345D
oklch(37.7% 0.076 315.5)
-
Step 950
950
#2F1F37
oklch(27% 0.048 313.9)
#643D74 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) | #334A76 | 0.083 |
| Deuteranopia (no green cones) | #3D4E72 | 0.077 |
| Tritanopia (no blue cones) | #634553 | 0.066 |
| Achromatopsia (no color) | #4C4C4C | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D74
#643D74
oklch(42.9% 0.098 315.5)
- #365B1F
#365B1F
oklch(42.9% 0.098 135.3)
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 #643D74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.064
- Twilight #4E518B ΔE 0.066
- Rebecca Purple #663399 ΔE 0.068
- Dusk #4E5481 ΔE 0.069
- Dusty Grape #545775 ΔE 0.075
- Blueberry #464196 ΔE 0.076
- Brownish Purple #76424E ΔE 0.078
- Light Eggplant #894585 ΔE 0.079
Use #643D74 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.