#643380
Closest named color: Rebecca Purple (#663399). oklch(42% 0.131 311.4), rgb(100, 51, 128).
Aa
White text reads best on this color (9.02:1).
About this color
#643380 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.131 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 0.041 away. White text reads best on it, at 9.02:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.32:1 |
| White text | 9.02:1 |
Values
| HEX | #643380 |
| RGB | rgb(100, 51, 128) |
| HSL | hsl(278, 43%, 35%) |
| OKLCH | oklch(42% 0.131 311.4) |
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 #643380 | 9.02:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #643380 | 2.32:1 | Fails | Lc 13.7 | Not readable |
| #643380 text on white | 9.02:1 | AAA | Lc 90.3 | Preferred for body text |
| #643380 text on black | 2.32:1 | Fails | Lc -12.0 | 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
#F8F4FB
oklch(97.2% 0.01 311.2)
-
Step 100
100
#EFE6F5
oklch(93.6% 0.022 312.2)
-
Step 200
200
#E2D2EE
oklch(88.5% 0.042 310.9)
-
Step 300
300
#D1B3E5
oklch(80.9% 0.076 311.7)
-
Step 400
400
#B98AD8
oklch(70.7% 0.121 311.2)
-
Step 500
500
#A86ACD
oklch(63.1% 0.156 311.6)
-
Step 600
600
#934FBA
oklch(55.5% 0.17 311.4)
-
Step 700
700
#7D3FA0
oklch(49% 0.157 311.4)
-
Step 800
800 (this color)
#643380
oklch(42% 0.131 311.4)
-
Step 900
900
#532F68
oklch(37.7% 0.101 311.6)
-
Step 950
950
#311C3D
oklch(27% 0.065 312.1)
#643380 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) | #1A4682 | 0.114 |
| Deuteranopia (no green cones) | #2D4A7E | 0.101 |
| Tritanopia (no blue cones) | #614154 | 0.090 |
| Achromatopsia (no color) | #494949 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643380
#643380
oklch(42% 0.131 311.4)
- #355900
#355900
oklch(42% 0.115 131.4)
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 #643380, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.041
- Dark Slate Blue #483D8B ΔE 0.057
- Blueberry #464196 ΔE 0.069
- Purple #800080 ΔE 0.078
- Twilight #4E518B ΔE 0.081
- Light Eggplant #894585 ΔE 0.088
- Dusk #4E5481 ΔE 0.090
- Dark Magenta #8B008B ΔE 0.093
Use #643380 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.