#644F9F
Closest named color: Twilight (#4E518B). oklch(48.8% 0.125 293.3), rgb(100, 79, 159).
Aa
White text reads best on this color (6.64:1).
About this color
#644F9F is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.125 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.049 away. White text reads best on it, at 6.64:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.125) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.16:1 |
| White text | 6.64:1 |
Values
| HEX | #644F9F |
| RGB | rgb(100, 79, 159) |
| HSL | hsl(256, 34%, 47%) |
| OKLCH | oklch(48.8% 0.125 293.3) |
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 #644F9F | 6.64:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #644F9F | 3.16:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #644F9F text on white | 6.64:1 | AA | Lc 82.6 | Fine for body text |
| #644F9F text on black | 3.16:1 | AA large text | Lc -19.3 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#D9D5EE
oklch(88.4% 0.034 293)
-
Step 300
300
#C2BAE5
oklch(81% 0.061 293.5)
-
Step 400
400
#A395D8
oklch(70.7% 0.097 293.3)
-
Step 500
500
#8D7ACD
oklch(63.2% 0.123 293.1)
-
Step 600
600
#7861BA
oklch(55.6% 0.135 293.4)
-
Step 700
700 (this color)
#644F9F
oklch(48.8% 0.125 293.3)
-
Step 800
800
#524282
oklch(42.7% 0.104 293)
-
Step 900
900
#443868
oklch(37.7% 0.081 293.7)
-
Step 950
950
#28213D
oklch(27% 0.052 294.2)
#644F9F 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) | #315DA2 | 0.073 |
| Deuteranopia (no green cones) | #355B9D | 0.069 |
| Tritanopia (no blue cones) | #565F6F | 0.102 |
| Achromatopsia (no color) | #5C5C5C | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644F9F
#644F9F
oklch(48.8% 0.125 293.3)
- #606600
#606600
oklch(48.8% 0.11 113.7)
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 #644F9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.049
- Iris #6258C4 ΔE 0.060
- Dusky Blue #475F94 ΔE 0.063
- Dusk #4E5481 ΔE 0.064
- Rebecca Purple #663399 ΔE 0.064
- Blueberry #464196 ΔE 0.066
- Denim Blue #3B5B92 ΔE 0.069
- Bluey Purple #6241C7 ΔE 0.073
Use #644F9F 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.