#644D91
Closest named color: Twilight (#4E518B). oklch(47.5% 0.109 297.7), rgb(100, 77, 145).
Aa
White text reads best on this color (6.97:1).
About this color
#644D91 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.109 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.038 away. White text reads best on it, at 6.97:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.109) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.01:1 |
| White text | 6.97:1 |
Values
| HEX | #644D91 |
| RGB | rgb(100, 77, 145) |
| HSL | hsl(260, 31%, 44%) |
| OKLCH | oklch(47.5% 0.109 297.7) |
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 #644D91 | 6.97:1 | AA | Lc -89.0 | Fine for body text |
| Black text on #644D91 | 3.01:1 | AA large text | Lc 20.0 | Dividers and decoration only |
| #644D91 text on white | 6.97:1 | AA | Lc 84.0 | Fine for body text |
| #644D91 text on black | 3.01:1 | AA large text | Lc -18.0 | 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
#EBE8F3
oklch(93.7% 0.015 298.6)
-
Step 200
200
#DBD5EA
oklch(88.4% 0.029 298.8)
-
Step 300
300
#C4BADF
oklch(80.9% 0.053 297.6)
-
Step 400
400
#A696CF
oklch(70.8% 0.084 297.1)
-
Step 500
500
#917BC2
oklch(63.1% 0.107 297.5)
-
Step 600
600
#7C63AE
oklch(55.6% 0.116 297.9)
-
Step 700
700 (this color)
#644D91
oklch(47.5% 0.109 297.7)
-
Step 800
800
#55437A
oklch(42.7% 0.09 297.5)
-
Step 900
900
#463962
oklch(37.7% 0.07 297.6)
-
Step 950
950
#292239
oklch(27.1% 0.043 297.5)
#644D91 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) | #385993 | 0.067 |
| Deuteranopia (no green cones) | #3D598F | 0.063 |
| Tritanopia (no blue cones) | #5B5968 | 0.085 |
| Achromatopsia (no color) | #595959 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644D91
#644D91
oklch(47.5% 0.109 297.7)
- #586404
#586404
oklch(47.6% 0.109 117.7)
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 #644D91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.038
- Dusk #4E5481 ΔE 0.049
- Dusky Blue #475F94 ΔE 0.061
- Blueberry #464196 ΔE 0.064
- Rebecca Purple #663399 ΔE 0.064
- Dusty Grape #545775 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.067
Use #644D91 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.