#644E9D
Closest named color: Twilight (#4E518B). oklch(48.5% 0.124 294.1), rgb(100, 78, 157).
Aa
White text reads best on this color (6.73:1).
About this color
#644E9D is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.124 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.047 away. White text reads best on it, at 6.73:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.124) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.11:1 |
| White text | 6.73:1 |
Values
| HEX | #644E9D |
| RGB | rgb(100, 78, 157) |
| HSL | hsl(257, 34%, 46%) |
| OKLCH | oklch(48.5% 0.124 294.1) |
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 #644E9D | 6.73:1 | AA | Lc -88.0 | Fine for body text |
| Black text on #644E9D | 3.11:1 | AA large text | Lc 21.0 | Dividers and decoration only |
| #644E9D text on white | 6.73:1 | AA | Lc 83.0 | Fine for body text |
| #644E9D text on black | 3.11:1 | AA large text | Lc -18.9 | 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
#F5F4FA
oklch(97% 0.008 293.9)
-
Step 100
100
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#DAD5EE
oklch(88.5% 0.034 294.9)
-
Step 300
300
#C2BAE4
oklch(80.9% 0.059 293.8)
-
Step 400
400
#A495D7
oklch(70.7% 0.096 294.2)
-
Step 500
500
#8E79CC
oklch(63% 0.123 294.2)
-
Step 600
600
#7961B9
oklch(55.6% 0.134 294.2)
-
Step 700
700 (this color)
#644E9D
oklch(48.5% 0.124 294.1)
-
Step 800
800
#534281
oklch(42.8% 0.102 294.1)
-
Step 900
900
#443867
oklch(37.6% 0.079 294)
-
Step 950
950
#28213D
oklch(27% 0.052 294.2)
#644E9D 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) | #315CA0 | 0.073 |
| Deuteranopia (no green cones) | #355A9B | 0.070 |
| Tritanopia (no blue cones) | #565D6E | 0.099 |
| Achromatopsia (no color) | #5C5C5C | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644E9D
#644E9D
oklch(48.5% 0.124 294.1)
- #5E6500
#5E6500
oklch(48.4% 0.109 114.4)
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 #644E9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.047
- Rebecca Purple #663399 ΔE 0.062
- Dusk #4E5481 ΔE 0.062
- Dusky Blue #475F94 ΔE 0.063
- Iris #6258C4 ΔE 0.063
- Blueberry #464196 ΔE 0.064
- Denim Blue #3B5B92 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.072
Use #644E9D 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.