#643DCB
Closest named color: Bluey Purple (#6241C7). oklch(49.2% 0.206 289.1), rgb(100, 61, 203).
Aa
White text reads best on this color (6.83:1).
About this color
#643DCB is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.206 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.010 away. White text reads best on it, at 6.83:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.206) |
| Temperature | cool |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 3.07:1 |
| White text | 6.83:1 |
Values
| HEX | #643DCB |
| RGB | rgb(100, 61, 203) |
| HSL | hsl(256, 58%, 52%) |
| OKLCH | oklch(49.2% 0.206 289.1) |
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 #643DCB | 6.83:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #643DCB | 3.07:1 | AA large text | Lc 21.1 | Dividers and decoration only |
| #643DCB text on white | 6.83:1 | AA | Lc 82.9 | Fine for body text |
| #643DCB text on black | 3.07:1 | AA large text | Lc -19.0 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E9E7FD
oklch(93.6% 0.03 290)
-
Step 200
200
#D7D4FC
oklch(88.5% 0.055 288.7)
-
Step 300
300
#BEB6FD
oklch(80.8% 0.1 289.1)
-
Step 400
400
#9F8DFC
oklch(70.7% 0.159 289.1)
-
Step 500
500
#8A6BFA
oklch(63% 0.204 289.2)
-
Step 600
600
#764DE9
oklch(55.5% 0.222 289.2)
-
Step 700
700 (this color)
#643DCB
oklch(49.2% 0.206 289.1)
-
Step 800
800
#5134A4
oklch(42.8% 0.17 289)
-
Step 900
900
#422F82
oklch(37.6% 0.133 288.9)
-
Step 950
950
#271D4C
oklch(27.1% 0.083 289.4)
#643DCB 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) | #005DCF | 0.107 |
| Deuteranopia (no green cones) | #0057C8 | 0.104 |
| Tritanopia (no blue cones) | #3F6280 | 0.166 |
| Achromatopsia (no color) | #5B5B5B | 0.207 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643DCB
#643DCB
oklch(49.2% 0.206 289.1)
- #666500
#666500
oklch(49.1% 0.107 109.1)
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 #643DCB, closest first.
No curated palette has a color within ΔE 0.04 of #643DCB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.010
- Blurple #5539CC ΔE 0.028
- Blue With A Hint Of Purple #533CC6 ΔE 0.030
- Burple #6832E3 ΔE 0.040
- Purple Blue #5D21D0 ΔE 0.045
- Purpley Blue #5F34E7 ΔE 0.046
- Iris #6258C4 ΔE 0.059
- Slate Blue #6A5ACD ΔE 0.063
Use #643DCB 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.