#643378
Closest named color: Rebecca Purple (#663399). oklch(41.5% 0.121 315.2), rgb(100, 51, 120).
Aa
White text reads best on this color (9.18:1).
About this color
#643378 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.121 and its hue 315°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.055 away. White text reads best on it, at 9.18:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #643378 |
| RGB | rgb(100, 51, 120) |
| HSL | hsl(283, 40%, 34%) |
| OKLCH | oklch(41.5% 0.121 315.2) |
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 #643378 | 9.18:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #643378 | 2.28:1 | Fails | Lc 13.2 | Not readable |
| #643378 text on white | 9.18:1 | AAA | Lc 90.8 | Preferred for body text |
| #643378 text on black | 2.28:1 | Fails | Lc -11.5 | 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
#F8F4FA
oklch(97.2% 0.009 314.8)
-
Step 100
100
#EFE6F3
oklch(93.6% 0.02 315.7)
-
Step 200
200
#E3D2EB
oklch(88.5% 0.038 315.1)
-
Step 300
300
#D2B3E0
oklch(80.8% 0.071 315.3)
-
Step 400
400
#BB8AD1
oklch(70.6% 0.114 315)
-
Step 500
500
#AA6BC5
oklch(63% 0.146 315.1)
-
Step 600
600
#9551B1
oklch(55.5% 0.157 315.1)
-
Step 700
700
#7F4198
oklch(49% 0.146 315.2)
-
Step 800
800 (this color)
#643378
oklch(41.5% 0.121 315.2)
-
Step 900
900
#543063
oklch(37.7% 0.094 315.2)
-
Step 950
950
#311C3A
oklch(26.8% 0.06 315.1)
#643378 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) | #22457A | 0.108 |
| Deuteranopia (no green cones) | #324976 | 0.096 |
| Tritanopia (no blue cones) | #633E50 | 0.080 |
| Achromatopsia (no color) | #484848 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643378
#643378
oklch(41.5% 0.121 315.2)
- #2B5901
#2B5901
oklch(41.5% 0.121 135.2)
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 #643378, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.062
- Blueberry #464196 ΔE 0.076
- Purple #800080 ΔE 0.081
- Twilight #4E518B ΔE 0.083
- Grape Purple #5D1451 ΔE 0.086
- Rich Purple #720058 ΔE 0.086
- Velvet #750851 ΔE 0.089
Use #643378 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.