#643AA4
Closest named color: Rebecca Purple (#663399). oklch(45.6% 0.163 297.8), rgb(100, 58, 164).
Aa
White text reads best on this color (7.82:1).
About this color
#643AA4 is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.163 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 0.023 away. White text reads best on it, at 7.82:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.163) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.68:1 |
| White text | 7.82:1 |
Values
| HEX | #643AA4 |
| RGB | rgb(100, 58, 164) |
| HSL | hsl(264, 48%, 44%) |
| OKLCH | oklch(45.6% 0.163 297.8) |
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 #643AA4 | 7.82:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #643AA4 | 2.68:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #643AA4 text on white | 7.82:1 | AAA | Lc 86.7 | Fine for body text |
| #643AA4 text on black | 2.68:1 | Fails | Lc -15.4 | 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 800.
-
Step 50
50
#F6F4FD
oklch(97.1% 0.012 296.4)
-
Step 100
100
#ECE6FA
oklch(93.6% 0.027 299.5)
-
Step 200
200
#DDD2F8
oklch(88.5% 0.053 298.5)
-
Step 300
300
#C8B4F7
oklch(81% 0.095 297.9)
-
Step 400
400
#AD89F3
oklch(70.7% 0.154 298)
-
Step 500
500
#9A67EE
oklch(63.1% 0.196 298)
-
Step 600
600
#854ADC
oklch(55.6% 0.211 297.6)
-
Step 700
700
#7139BF
oklch(49% 0.197 297.7)
-
Step 800
800 (this color)
#643AA4
oklch(45.6% 0.163 297.8)
-
Step 900
900
#4B2D7B
oklch(37.7% 0.127 297.7)
-
Step 950
950
#2C1B48
oklch(27% 0.081 298.2)
#643AA4 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) | #0052A7 | 0.114 |
| Deuteranopia (no green cones) | #0051A2 | 0.114 |
| Tritanopia (no blue cones) | #555269 | 0.126 |
| Achromatopsia (no color) | #525252 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643AA4
#643AA4
oklch(45.6% 0.163 297.8)
- #525E00
#525E00
oklch(45.6% 0.106 118)
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 #643AA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.023
- Blueberry #464196 ΔE 0.057
- Bluey Purple #6241C7 ΔE 0.057
- Blue With A Hint Of Purple #533CC6 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.064
- Grape #7209B7 ΔE 0.069
- Blurple #5539CC ΔE 0.070
- Chrysanthemum #560BAD ΔE 0.075
Use #643AA4 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.