#643188
Closest named color: Rebecca Purple (#663399). oklch(42.3% 0.143 308.5), rgb(100, 49, 136).
Aa
White text reads best on this color (8.98:1).
About this color
#643188 is a dark, vivid purple. In OKLCH its lightness is 42%, its chroma 0.143 and its hue 308°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.028 away. White text reads best on it, at 8.98:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | vivid (0.143) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.33:1 |
| White text | 8.98:1 |
Values
| HEX | #643188 |
| RGB | rgb(100, 49, 136) |
| HSL | hsl(275, 47%, 36%) |
| OKLCH | oklch(42.3% 0.143 308.5) |
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 #643188 | 8.98:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #643188 | 2.33:1 | Fails | Lc 13.8 | Not readable |
| #643188 text on white | 8.98:1 | AAA | Lc 90.1 | Preferred for body text |
| #643188 text on black | 2.33:1 | Fails | Lc -12.1 | 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
#EEE6F7
oklch(93.6% 0.024 307)
-
Step 200
200
#E2D1F1
oklch(88.4% 0.047 309.2)
-
Step 300
300
#D0B2EA
oklch(80.8% 0.084 308.9)
-
Step 400
400
#B888E0
oklch(70.6% 0.134 308.4)
-
Step 500
500
#A768D7
oklch(63.2% 0.17 308.5)
-
Step 600
600
#924CC4
oklch(55.6% 0.185 308.4)
-
Step 700
700
#7D3CAA
oklch(49.2% 0.173 308.5)
-
Step 800
800 (this color)
#643188
oklch(42.3% 0.143 308.5)
-
Step 900
900
#522D6E
oklch(37.6% 0.112 308.2)
-
Step 950
950
#301B40
oklch(26.9% 0.07 308.6)
#643188 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) | #04478B | 0.125 |
| Deuteranopia (no green cones) | #234A86 | 0.111 |
| Tritanopia (no blue cones) | #5F4258 | 0.099 |
| Achromatopsia (no color) | #494949 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643188
#643188
oklch(42.3% 0.143 308.5)
- #3B5900
#3B5900
oklch(42.4% 0.112 128.7)
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 #643188, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.028
- Dark Slate Blue #483D8B ΔE 0.056
- Blueberry #464196 ΔE 0.065
- Purple #800080 ΔE 0.076
- Twilight #4E518B ΔE 0.084
- Chrysanthemum #560BAD ΔE 0.087
- Dark Magenta #8B008B ΔE 0.089
- Grape #7209B7 ΔE 0.090
Use #643188 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.