#643B85
Closest named color: Rebecca Purple (#663399). oklch(43.6% 0.123 307.7), rgb(100, 59, 133).
Aa
White text reads best on this color (8.37:1).
About this color
#643B85 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.123 and its hue 308°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.039 away. White text reads best on it, at 8.37:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.50:1 |
| White text | 8.37:1 |
Values
| HEX | #643B85 |
| RGB | rgb(100, 59, 133) |
| HSL | hsl(273, 39%, 38%) |
| OKLCH | oklch(43.6% 0.123 307.7) |
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 #643B85 | 8.37:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #643B85 | 2.50:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #643B85 text on white | 8.37:1 | AAA | Lc 88.6 | Fine for body text |
| #643B85 text on black | 2.50:1 | Fails | Lc -13.6 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EEE6F5
oklch(93.6% 0.022 309.6)
-
Step 200
200
#E0D3EE
oklch(88.6% 0.039 307.2)
-
Step 300
300
#CDB5E5
oklch(80.9% 0.071 307.5)
-
Step 400
400
#B48DD8
oklch(70.7% 0.114 307.5)
-
Step 500
500
#A26ECE
oklch(63.1% 0.148 307.7)
-
Step 600
600
#8D54BA
oklch(55.6% 0.16 307.8)
-
Step 700
700
#7844A1
oklch(49.2% 0.149 307.6)
-
Step 800
800 (this color)
#643B85
oklch(43.6% 0.123 307.7)
-
Step 900
900
#4F3168
oklch(37.5% 0.096 307.6)
-
Step 950
950
#2F1D3D
oklch(27% 0.062 308.8)
#643B85 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) | #244C87 | 0.099 |
| Deuteranopia (no green cones) | #314E83 | 0.090 |
| Tritanopia (no blue cones) | #5F485A | 0.088 |
| Achromatopsia (no color) | #4E4E4E | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B85
#643B85
oklch(43.6% 0.123 307.7)
- #3F5C00
#3F5C00
oklch(43.5% 0.113 127.8)
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 #643B85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.051
- Blueberry #464196 ΔE 0.060
- Twilight #4E518B ΔE 0.064
- Dusk #4E5481 ΔE 0.075
- Light Eggplant #894585 ΔE 0.078
- Dusty Grape #545775 ΔE 0.089
- Purple #800080 ΔE 0.091
Use #643B85 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.