#643491
Closest named color: Rebecca Purple (#663399). oklch(43.3% 0.149 304.7), rgb(100, 52, 145).
Aa
White text reads best on this color (8.59:1).
About this color
#643491 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.149 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.014 away. White text reads best on it, at 8.59:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.149) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #643491 |
| RGB | rgb(100, 52, 145) |
| HSL | hsl(271, 47%, 39%) |
| OKLCH | oklch(43.3% 0.149 304.7) |
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 #643491 | 8.59:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #643491 | 2.44:1 | Fails | Lc 14.9 | Not readable |
| #643491 text on white | 8.59:1 | AAA | Lc 89.1 | Fine for body text |
| #643491 text on black | 2.44:1 | Fails | Lc -13.2 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F8
oklch(93.6% 0.025 303.5)
-
Step 200
200
#E0D2F4
oklch(88.6% 0.048 304.1)
-
Step 300
300
#CDB3EE
oklch(80.9% 0.086 304.6)
-
Step 400
400
#B489E6
oklch(70.7% 0.139 304.4)
-
Step 500
500
#A368DF
oklch(63.2% 0.178 304.7)
-
Step 600
600
#8E4BCC
oklch(55.6% 0.194 304.7)
-
Step 700
700
#793BB1
oklch(49.1% 0.181 304.7)
-
Step 800
800 (this color)
#643491
oklch(43.3% 0.149 304.7)
-
Step 900
900
#502D72
oklch(37.6% 0.116 304.8)
-
Step 950
950
#2F1B43
oklch(27% 0.074 305)
#643491 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) | #004B94 | 0.122 |
| Deuteranopia (no green cones) | #1C4C8F | 0.112 |
| Tritanopia (no blue cones) | #5C475D | 0.108 |
| Achromatopsia (no color) | #4C4C4C | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643491
#643491
oklch(43.3% 0.149 304.7)
- #445A00
#445A00
oklch(43.3% 0.108 124.4)
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 #643491, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.014
- Dark Slate Blue #483D8B ΔE 0.054
- Blueberry #464196 ΔE 0.058
- Twilight #4E518B ΔE 0.080
- Chrysanthemum #560BAD ΔE 0.080
- Grape #7209B7 ΔE 0.080
- Purple #800080 ΔE 0.084
- Bluey Purple #6241C7 ΔE 0.090
Use #643491 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.