#643389
Closest named color: Rebecca Purple (#663399). oklch(42.6% 0.141 307.7), rgb(100, 51, 137).
Aa
White text reads best on this color (8.83:1).
About this color
#643389 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.141 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 0.026 away. White text reads best on it, at 8.83:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.141) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.37:1 |
| White text | 8.83:1 |
Values
| HEX | #643389 |
| RGB | rgb(100, 51, 137) |
| HSL | hsl(274, 46%, 37%) |
| OKLCH | oklch(42.6% 0.141 307.7) |
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 #643389 | 8.83:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #643389 | 2.37:1 | Fails | Lc 14.2 | Not readable |
| #643389 text on white | 8.83:1 | AAA | Lc 89.8 | Fine for body text |
| #643389 text on black | 2.37:1 | Fails | Lc -12.5 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EEE6F7
oklch(93.6% 0.024 307)
-
Step 200
200
#E1D2F1
oklch(88.5% 0.045 307.2)
-
Step 300
300
#CFB3EA
oklch(80.9% 0.082 307.7)
-
Step 400
400
#B789E0
oklch(70.7% 0.132 307.6)
-
Step 500
500
#A569D7
oklch(63.1% 0.168 307.5)
-
Step 600
600
#914DC4
oklch(55.6% 0.183 307.9)
-
Step 700
700
#7B3DA9
oklch(49.1% 0.17 307.7)
-
Step 800
800 (this color)
#643389
oklch(42.6% 0.141 307.7)
-
Step 900
900
#522E6E
oklch(37.8% 0.11 308)
-
Step 950
950
#301C40
oklch(27.1% 0.068 308.1)
#643389 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) | #0A488C | 0.121 |
| Deuteranopia (no green cones) | #254B87 | 0.107 |
| Tritanopia (no blue cones) | #5E4459 | 0.100 |
| Achromatopsia (no color) | #4A4A4A | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643389
#643389
oklch(42.6% 0.141 307.7)
- #3D5900
#3D5900
oklch(42.6% 0.111 127.7)
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 #643389, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.026
- Dark Slate Blue #483D8B ΔE 0.054
- Blueberry #464196 ΔE 0.063
- Purple #800080 ΔE 0.079
- Twilight #4E518B ΔE 0.080
- Chrysanthemum #560BAD ΔE 0.088
- Light Eggplant #894585 ΔE 0.090
- Grape #7209B7 ΔE 0.090
Use #643389 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.