#640DB4
Closest named color: Grape (#7209B7). oklch(42.7% 0.222 298.6), rgb(100, 13, 180).
Aa
White text reads best on this color (9.29:1).
About this color
#640DB4 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.222 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grape (#7209B7), ΔE 0.029 away. White text reads best on it, at 9.29:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.222) |
| Temperature | in between |
| Nearest name | Grape (#7209B7) |
| Black text | 2.25:1 |
| White text | 9.29:1 |
Values
| HEX | #640DB4 |
| RGB | rgb(100, 13, 180) |
| HSL | hsl(271, 87%, 38%) |
| OKLCH | oklch(42.7% 0.222 298.6) |
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 #640DB4 | 9.29:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #640DB4 | 2.25:1 | Fails | Lc 14.4 | Not readable |
| #640DB4 text on white | 9.29:1 | AAA | Lc 89.6 | Fine for body text |
| #640DB4 text on black | 2.25:1 | Fails | Lc -12.6 | 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
#F7F3FF
oklch(97.1% 0.016 301.2)
-
Step 100
100
#EDE5FF
oklch(93.6% 0.036 299.7)
-
Step 200
200
#DED0FF
oklch(88.4% 0.066 298.7)
-
Step 300
300
#CAB1FF
oklch(81% 0.111 298.6)
-
Step 400
400
#B083FF
oklch(70.6% 0.179 298.5)
-
Step 500
500
#9F5BFF
oklch(63% 0.232 298.5)
-
Step 600
600
#9019FF
oklch(55.6% 0.287 298.6)
-
Step 700
700
#7B00DD
oklch(49.1% 0.264 298.7)
-
Step 800
800 (this color)
#640DB4
oklch(42.7% 0.222 298.6)
-
Step 900
900
#511B8E
oklch(37.7% 0.173 298.8)
-
Step 950
950
#2F1353
oklch(27% 0.109 298.8)
#640DB4 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) | #0047B8 | 0.137 |
| Deuteranopia (no green cones) | #0045B1 | 0.137 |
| Tritanopia (no blue cones) | #4F4669 | 0.164 |
| Achromatopsia (no color) | #474747 | 0.224 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #640DB4
#640DB4
oklch(42.7% 0.222 298.6)
- #4A5600
#4A5600
oklch(42.8% 0.1 118.6)
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 #640DB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grape #7209B7 ΔE 0.029
- Chrysanthemum #560BAD ΔE 0.031
- Purple Blue #5D21D0 ΔE 0.054
- Violet Blue #510AC9 ΔE 0.055
- Imperial Purple #480CA8 ΔE 0.061
- Rebecca Purple #663399 ΔE 0.065
- Blurple #5539CC ΔE 0.075
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
Use #640DB4 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.