#644C9F
Closest named color: Twilight (#4E518B). oklch(48.2% 0.13 294.4), rgb(100, 76, 159).
Aa
White text reads best on this color (6.82:1).
About this color
#644C9F is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.130 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.051 away. White text reads best on it, at 6.82:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.130) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.07:1 |
| White text | 6.82:1 |
Values
| HEX | #644C9F |
| RGB | rgb(100, 76, 159) |
| HSL | hsl(257, 35%, 46%) |
| OKLCH | oklch(48.2% 0.13 294.4) |
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 #644C9F | 6.82:1 | AA | Lc -88.4 | Fine for body text |
| Black text on #644C9F | 3.07:1 | AA large text | Lc 20.7 | Dividers and decoration only |
| #644C9F text on white | 6.82:1 | AA | Lc 83.4 | Fine for body text |
| #644C9F text on black | 3.07:1 | AA large text | Lc -18.6 | 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
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#DAD5EE
oklch(88.5% 0.034 294.9)
-
Step 300
300
#C2B9E6
oklch(80.8% 0.063 294.1)
-
Step 400
400
#A494D9
oklch(70.6% 0.1 294.3)
-
Step 500
500
#8F78CF
oklch(63.1% 0.129 294.6)
-
Step 600
600
#7A60BC
oklch(55.7% 0.139 294.5)
-
Step 700
700 (this color)
#644C9F
oklch(48.2% 0.13 294.4)
-
Step 800
800
#534183
oklch(42.7% 0.107 294)
-
Step 900
900
#453769
oklch(37.6% 0.084 294.9)
-
Step 950
950
#28213E
oklch(27.1% 0.053 293.6)
#644C9F 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) | #2B5CA2 | 0.080 |
| Deuteranopia (no green cones) | #30599D | 0.075 |
| Tritanopia (no blue cones) | #565D6E | 0.105 |
| Achromatopsia (no color) | #5B5B5B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644C9F
#644C9F
oklch(48.2% 0.13 294.4)
- #5E6400
#5E6400
oklch(48.2% 0.108 113.8)
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 #644C9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.051
- Rebecca Purple #663399 ΔE 0.057
- Blueberry #464196 ΔE 0.061
- Iris #6258C4 ΔE 0.062
- Dusk #4E5481 ΔE 0.067
- Dusky Blue #475F94 ΔE 0.068
- Bluey Purple #6241C7 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.070
Use #644C9F 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.