#643581
Closest named color: Rebecca Purple (#663399). oklch(42.4% 0.128 310.6), rgb(100, 53, 129).
Aa
White text reads best on this color (8.86:1).
About this color
#643581 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.128 and its hue 311°. 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 8.86:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.128) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.36:1 |
| White text | 8.86:1 |
Values
| HEX | #643581 |
| RGB | rgb(100, 53, 129) |
| HSL | hsl(277, 42%, 36%) |
| OKLCH | oklch(42.4% 0.128 310.6) |
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 #643581 | 8.86:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #643581 | 2.36:1 | Fails | Lc 14.1 | Not readable |
| #643581 text on white | 8.86:1 | AAA | Lc 89.9 | Fine for body text |
| #643581 text on black | 2.36:1 | Fails | Lc -12.3 | 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
#EEE6F5
oklch(93.6% 0.022 309.6)
-
Step 200
200
#E2D2EE
oklch(88.5% 0.042 310.9)
-
Step 300
300
#D0B3E5
oklch(80.8% 0.076 310.8)
-
Step 400
400
#B88AD8
oklch(70.6% 0.121 310.6)
-
Step 500
500
#A76BCD
oklch(63.1% 0.154 311)
-
Step 600
600
#9251BA
oklch(55.7% 0.166 310.7)
-
Step 700
700
#7C41A0
oklch(49.1% 0.154 310.6)
-
Step 800
800 (this color)
#643581
oklch(42.4% 0.128 310.6)
-
Step 900
900
#523068
oklch(37.7% 0.099 310.5)
-
Step 950
950
#301C3D
oklch(26.9% 0.064 310.7)
#643581 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) | #1C4883 | 0.111 |
| Deuteranopia (no green cones) | #2E4B7F | 0.098 |
| Tritanopia (no blue cones) | #604355 | 0.091 |
| Achromatopsia (no color) | #4A4A4A | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643581
#643581
oklch(42.4% 0.128 310.6)
- #375A00
#375A00
oklch(42.4% 0.116 130.8)
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 #643581, 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 0.055
- Blueberry #464196 ΔE 0.066
- Twilight #4E518B ΔE 0.077
- Purple #800080 ΔE 0.081
- Light Eggplant #894585 ΔE 0.086
- Dusk #4E5481 ΔE 0.086
- Dark Magenta #8B008B ΔE 0.095
Use #643581 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.