#643F83
Closest named color: Rebecca Purple (#663399). oklch(44.2% 0.114 307.5), rgb(100, 63, 131).
Aa
White text reads best on this color (8.13:1).
About this color
#643F83 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.114 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 0.047 away. White text reads best on it, at 8.13:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.114) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #643F83 |
| RGB | rgb(100, 63, 131) |
| HSL | hsl(273, 35%, 38%) |
| OKLCH | oklch(44.2% 0.114 307.5) |
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 #643F83 | 8.13:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #643F83 | 2.58:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #643F83 text on white | 8.13:1 | AAA | Lc 87.9 | Fine for body text |
| #643F83 text on black | 2.58:1 | Fails | Lc -14.2 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EDE7F4
oklch(93.6% 0.018 306.7)
-
Step 200
200
#E0D3ED
oklch(88.5% 0.038 308)
-
Step 300
300
#CCB6E3
oklch(81% 0.067 307.1)
-
Step 400
400
#B28ED4
oklch(70.6% 0.107 307.4)
-
Step 500
500
#A071C9
oklch(63.2% 0.136 307.5)
-
Step 600
600
#8B58B5
oklch(55.7% 0.147 307.6)
-
Step 700
700
#76479C
oklch(49.1% 0.138 307.6)
-
Step 800
800 (this color)
#643F83
oklch(44.2% 0.114 307.5)
-
Step 900
900
#4E3366
oklch(37.7% 0.089 307.1)
-
Step 950
950
#2E1E3C
oklch(27% 0.058 307.5)
#643F83 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) | #2C4E85 | 0.089 |
| Deuteranopia (no green cones) | #375081 | 0.081 |
| Tritanopia (no blue cones) | #5F4B5B | 0.082 |
| Achromatopsia (no color) | #4F4F4F | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F83
#643F83
oklch(44.2% 0.114 307.5)
- #415E02
#415E02
oklch(44.2% 0.114 127.6)
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 #643F83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.053
- Twilight #4E518B ΔE 0.056
- Blueberry #464196 ΔE 0.061
- Dusk #4E5481 ΔE 0.065
- Light Eggplant #894585 ΔE 0.074
- Dusty Grape #545775 ΔE 0.078
- Denim Blue #3B5B92 ΔE 0.091
Use #643F83 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.