#643EA0
Closest named color: Rebecca Purple (#663399). oklch(45.9% 0.153 298), rgb(100, 62, 160).
Aa
White text reads best on this color (7.66:1).
About this color
#643EA0 is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.153 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.025 away. White text reads best on it, at 7.66:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.153) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.73:1 |
| White text | 7.66:1 |
Values
| HEX | #643EA0 |
| RGB | rgb(100, 62, 160) |
| HSL | hsl(263, 44%, 44%) |
| OKLCH | oklch(45.9% 0.153 298) |
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 #643EA0 | 7.66:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #643EA0 | 2.73:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #643EA0 text on white | 7.66:1 | AAA | Lc 86.2 | Fine for body text |
| #643EA0 text on black | 2.73:1 | Fails | Lc -15.8 | Dividers and decoration only |
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 700.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F7
oklch(93.6% 0.022 297.4)
-
Step 200
200
#DCD4F1
oklch(88.5% 0.04 298.2)
-
Step 300
300
#C6B7EB
oklch(80.9% 0.074 297.9)
-
Step 400
400
#AA90E1
oklch(70.8% 0.119 298.1)
-
Step 500
500
#9572D8
oklch(63% 0.151 297.7)
-
Step 600
600
#8158C5
oklch(55.6% 0.164 298.2)
-
Step 700
700 (this color)
#643EA0
oklch(45.9% 0.153 298)
-
Step 800
800
#593B8A
oklch(42.7% 0.127 298.4)
-
Step 900
900
#49346E
oklch(37.8% 0.097 298.3)
-
Step 950
950
#2A1F41
oklch(27% 0.062 297)
#643EA0 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) | #0053A3 | 0.111 |
| Deuteranopia (no green cones) | #16529E | 0.104 |
| Tritanopia (no blue cones) | #565369 | 0.117 |
| Achromatopsia (no color) | #535353 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643EA0
#643EA0
oklch(45.9% 0.153 298)
- #535F00
#535F00
oklch(45.9% 0.107 117.9)
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 #643EA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.025
- Blueberry #464196 ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.060
- Bluey Purple #6241C7 ΔE 0.062
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
- Twilight #4E518B ΔE 0.070
- Blurple #5539CC ΔE 0.077
- Grape #7209B7 ΔE 0.079
Use #643EA0 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.