#643278
Closest named color: Rebecca Purple (#663399). oklch(41.4% 0.123 315.3), rgb(100, 50, 120).
Aa
White text reads best on this color (9.25:1).
About this color
#643278 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.123 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 0.054 away. White text reads best on it, at 9.25:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #643278 |
| RGB | rgb(100, 50, 120) |
| HSL | hsl(283, 41%, 33%) |
| OKLCH | oklch(41.4% 0.123 315.3) |
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 #643278 | 9.25:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #643278 | 2.26:1 | Fails | Lc 13.0 | Not readable |
| #643278 text on white | 9.25:1 | AAA | Lc 91.0 | Preferred for body text |
| #643278 text on black | 2.26:1 | Fails | Lc -11.4 | 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
#EFE6F4
oklch(93.6% 0.021 313.8)
-
Step 200
200
#E3D2EC
oklch(88.5% 0.04 314.1)
-
Step 300
300
#D3B3E1
oklch(80.9% 0.072 315.5)
-
Step 400
400
#BC8AD2
oklch(70.7% 0.115 315.2)
-
Step 500
500
#AB6BC5
oklch(63.1% 0.146 315.6)
-
Step 600
600
#9650B2
oklch(55.6% 0.161 315.4)
-
Step 700
700
#804099
oklch(49.1% 0.149 315.5)
-
Step 800
800 (this color)
#643278
oklch(41.4% 0.123 315.3)
-
Step 900
900
#552F64
oklch(37.7% 0.097 315.7)
-
Step 950
950
#321C3A
oklch(27% 0.061 316.6)
#643278 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) | #20447A | 0.111 |
| Deuteranopia (no green cones) | #324976 | 0.098 |
| Tritanopia (no blue cones) | #633E50 | 0.082 |
| Achromatopsia (no color) | #474747 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643278
#643278
oklch(41.4% 0.123 315.3)
- #2A5900
#2A5900
oklch(41.4% 0.122 135.4)
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 #643278, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.063
- Blueberry #464196 ΔE 0.077
- Purple #800080 ΔE 0.079
- Grape Purple #5D1451 ΔE 0.085
- Rich Purple #720058 ΔE 0.085
- Twilight #4E518B ΔE 0.085
- Velvet #750851 ΔE 0.088
Use #643278 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.