#644D97
Closest named color: Twilight (#4E518B). oklch(47.9% 0.117 296), rgb(100, 77, 151).
Aa
White text reads best on this color (6.88:1).
About this color
#644D97 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.117 and its hue 296°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.042 away. White text reads best on it, at 6.88:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.117) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.05:1 |
| White text | 6.88:1 |
Values
| HEX | #644D97 |
| RGB | rgb(100, 77, 151) |
| HSL | hsl(259, 32%, 45%) |
| OKLCH | oklch(47.9% 0.117 296) |
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 #644D97 | 6.88:1 | AA | Lc -88.6 | Fine for body text |
| Black text on #644D97 | 3.05:1 | AA large text | Lc 20.4 | Dividers and decoration only |
| #644D97 text on white | 6.88:1 | AA | Lc 83.6 | Fine for body text |
| #644D97 text on black | 3.05:1 | AA large text | Lc -18.3 | 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
#F6F4FA
oklch(97% 0.008 301.4)
-
Step 100
100
#EAE8F4
oklch(93.6% 0.016 293.7)
-
Step 200
200
#DAD5EC
oklch(88.4% 0.032 295.7)
-
Step 300
300
#C3BAE2
oklch(80.9% 0.057 295.4)
-
Step 400
400
#A595D3
oklch(70.7% 0.091 295.8)
-
Step 500
500
#907AC7
oklch(63.1% 0.115 296.1)
-
Step 600
600
#7B62B4
oklch(55.7% 0.125 296.1)
-
Step 700
700 (this color)
#644D97
oklch(47.9% 0.117 296)
-
Step 800
800
#54427E
oklch(42.7% 0.098 295.8)
-
Step 900
900
#453865
oklch(37.6% 0.076 295.8)
-
Step 950
950
#29213B
oklch(27% 0.048 297.2)
#644D97 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) | #345B9A | 0.072 |
| Deuteranopia (no green cones) | #385995 | 0.068 |
| Tritanopia (no blue cones) | #595B6B | 0.093 |
| Achromatopsia (no color) | #5A5A5A | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644D97
#644D97
oklch(47.9% 0.117 296)
- #5B6400
#5B6400
oklch(47.9% 0.109 115.7)
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 #644D97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.042
- Dusk #4E5481 ΔE 0.056
- Rebecca Purple #663399 ΔE 0.061
- Blueberry #464196 ΔE 0.062
- Dusky Blue #475F94 ΔE 0.063
- Denim Blue #3B5B92 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.068
- Dusty Grape #545775 ΔE 0.073
Use #644D97 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.