#644E99
Closest named color: Twilight (#4E518B). oklch(48.2% 0.118 295.1), rgb(100, 78, 153).
Aa
White text reads best on this color (6.79:1).
About this color
#644E99 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.118 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.043 away. White text reads best on it, at 6.79:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.118) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.09:1 |
| White text | 6.79:1 |
Values
| HEX | #644E99 |
| RGB | rgb(100, 78, 153) |
| HSL | hsl(258, 32%, 45%) |
| OKLCH | oklch(48.2% 0.118 295.1) |
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 #644E99 | 6.79:1 | AA | Lc -88.3 | Fine for body text |
| Black text on #644E99 | 3.09:1 | AA large text | Lc 20.8 | Dividers and decoration only |
| #644E99 text on white | 6.79:1 | AA | Lc 83.3 | Fine for body text |
| #644E99 text on black | 3.09:1 | AA large text | Lc -18.7 | 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
#A495D4
oklch(70.6% 0.092 294.9)
-
Step 500
500
#8F7AC8
oklch(63.1% 0.116 295.2)
-
Step 600
600
#7A62B5
oklch(55.7% 0.127 295.3)
-
Step 700
700 (this color)
#644E99
oklch(48.2% 0.118 295.1)
-
Step 800
800
#54427E
oklch(42.7% 0.098 295.8)
-
Step 900
900
#453866
oklch(37.7% 0.078 295.4)
-
Step 950
950
#28213B
oklch(26.9% 0.048 295.4)
#644E99 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) | #345C9C | 0.071 |
| Deuteranopia (no green cones) | #385A97 | 0.067 |
| Tritanopia (no blue cones) | #585C6C | 0.094 |
| Achromatopsia (no color) | #5B5B5B | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644E99
#644E99
oklch(48.2% 0.118 295.1)
- #5D6500
#5D6500
oklch(48.3% 0.11 115.1)
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 #644E99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.043
- Dusk #4E5481 ΔE 0.057
- Dusky Blue #475F94 ΔE 0.061
- Rebecca Purple #663399 ΔE 0.063
- Blueberry #464196 ΔE 0.063
- Denim Blue #3B5B92 ΔE 0.067
- Iris #6258C4 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.071
Use #644E99 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.