#644C9A
Closest named color: Twilight (#4E518B). oklch(47.9% 0.123 295.6), rgb(100, 76, 154).
Aa
White text reads best on this color (6.90:1).
About this color
#644C9A is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.123 and its hue 296°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.046 away. White text reads best on it, at 6.90:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.04:1 |
| White text | 6.90:1 |
Values
| HEX | #644C9A |
| RGB | rgb(100, 76, 154) |
| HSL | hsl(258, 34%, 45%) |
| OKLCH | oklch(47.9% 0.123 295.6) |
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 #644C9A | 6.90:1 | AA | Lc -88.7 | Fine for body text |
| Black text on #644C9A | 3.04:1 | AA large text | Lc 20.4 | Dividers and decoration only |
| #644C9A text on white | 6.90:1 | AA | Lc 83.7 | Fine for body text |
| #644C9A text on black | 3.04:1 | 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
#DAD5ED
oklch(88.4% 0.033 295.3)
-
Step 300
300
#C3B9E3
oklch(80.8% 0.059 296)
-
Step 400
400
#A595D6
oklch(70.8% 0.095 295.2)
-
Step 500
500
#9079CB
oklch(63.1% 0.122 295.6)
-
Step 600
600
#7B61B7
oklch(55.7% 0.131 295.8)
-
Step 700
700 (this color)
#644C9A
oklch(47.9% 0.123 295.6)
-
Step 800
800
#544180
oklch(42.6% 0.103 295.6)
-
Step 900
900
#453867
oklch(37.7% 0.079 295.1)
-
Step 950
950
#29213C
oklch(27.1% 0.05 296.6)
#644C9A 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) | #305B9D | 0.076 |
| Deuteranopia (no green cones) | #355998 | 0.071 |
| Tritanopia (no blue cones) | #585B6C | 0.097 |
| Achromatopsia (no color) | #5A5A5A | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644C9A
#644C9A
oklch(47.9% 0.123 295.6)
- #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 #644C9A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.046
- Rebecca Purple #663399 ΔE 0.057
- Blueberry #464196 ΔE 0.061
- Dusk #4E5481 ΔE 0.061
- Dusky Blue #475F94 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.068
- Iris #6258C4 ΔE 0.069
- Denim Blue #3B5B92 ΔE 0.071
Use #644C9A 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.