#643B86
Closest named color: Rebecca Purple (#663399). oklch(43.7% 0.125 307.2), rgb(100, 59, 134).
Aa
White text reads best on this color (8.36:1).
About this color
#643B86 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.125 and its hue 307°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.037 away. White text reads best on it, at 8.36:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.125) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.51:1 |
| White text | 8.36:1 |
Values
| HEX | #643B86 |
| RGB | rgb(100, 59, 134) |
| HSL | hsl(273, 39%, 38%) |
| OKLCH | oklch(43.7% 0.125 307.2) |
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 #643B86 | 8.36:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #643B86 | 2.51:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #643B86 text on white | 8.36:1 | AAA | Lc 88.5 | Fine for body text |
| #643B86 text on black | 2.51:1 | 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
#EDE6F5
oklch(93.5% 0.021 306.8)
-
Step 200
200
#E0D3EF
oklch(88.6% 0.04 306.5)
-
Step 300
300
#CDB5E6
oklch(81% 0.073 307)
-
Step 400
400
#B48DD9
oklch(70.8% 0.116 307.2)
-
Step 500
500
#A26ECF
oklch(63.2% 0.149 307.4)
-
Step 600
600
#8D54BC
oklch(55.7% 0.162 307.2)
-
Step 700
700
#7844A2
oklch(49.2% 0.15 307.3)
-
Step 800
800 (this color)
#643B86
oklch(43.7% 0.125 307.2)
-
Step 900
900
#4F3169
oklch(37.6% 0.097 307.1)
-
Step 950
950
#2E1D3E
oklch(26.9% 0.063 306.4)
#643B86 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) | #234C89 | 0.100 |
| Deuteranopia (no green cones) | #304E84 | 0.090 |
| Tritanopia (no blue cones) | #5F495A | 0.091 |
| Achromatopsia (no color) | #4E4E4E | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B86
#643B86
oklch(43.7% 0.125 307.2)
- #405C00
#405C00
oklch(43.6% 0.113 127.3)
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 #643B86, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.051
- Blueberry #464196 ΔE 0.059
- Twilight #4E518B ΔE 0.064
- Dusk #4E5481 ΔE 0.075
- Light Eggplant #894585 ΔE 0.079
- Dusty Grape #545775 ΔE 0.089
- Purple #800080 ΔE 0.091
Use #643B86 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.