#643E87
Closest named color: Rebecca Purple (#663399). oklch(44.2% 0.121 306.1), rgb(100, 62, 135).
Aa
White text reads best on this color (8.13:1).
About this color
#643E87 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.121 and its hue 306°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.040 away. White text reads best on it, at 8.13:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #643E87 |
| RGB | rgb(100, 62, 135) |
| HSL | hsl(271, 37%, 39%) |
| OKLCH | oklch(44.2% 0.121 306.1) |
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 #643E87 | 8.13:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #643E87 | 2.58:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #643E87 text on white | 8.13:1 | AAA | Lc 87.9 | Fine for body text |
| #643E87 text on black | 2.58:1 | Fails | Lc -14.3 | 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
#EDE7F5
oklch(93.7% 0.02 305.3)
-
Step 200
200
#DFD3EE
oklch(88.5% 0.039 305.6)
-
Step 300
300
#CCB5E5
oklch(80.8% 0.071 306.6)
-
Step 400
400
#B28ED8
oklch(70.7% 0.112 306)
-
Step 500
500
#9F70CE
oklch(63.1% 0.144 305.7)
-
Step 600
600
#8A56BA
oklch(55.6% 0.156 306)
-
Step 700
700
#7645A1
oklch(49.1% 0.147 306.3)
-
Step 800
800 (this color)
#643E87
oklch(44.2% 0.121 306.1)
-
Step 900
900
#4E3269
oklch(37.7% 0.095 305.8)
-
Step 950
950
#2E1E3D
oklch(27% 0.059 306.7)
#643E87 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) | #274E89 | 0.094 |
| Deuteranopia (no green cones) | #335085 | 0.085 |
| Tritanopia (no blue cones) | #5E4B5C | 0.088 |
| Achromatopsia (no color) | #4F4F4F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643E87
#643E87
oklch(44.2% 0.121 306.1)
- #435D00
#435D00
oklch(44.1% 0.112 126.2)
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 #643E87, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.051
- Blueberry #464196 ΔE 0.058
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.069
- Light Eggplant #894585 ΔE 0.075
- Dusty Grape #545775 ΔE 0.083
- Denim Blue #3B5B92 ΔE 0.092
Use #643E87 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.