#644CA1
Closest named color: Twilight (#4E518B). oklch(48.3% 0.132 293.9), rgb(100, 76, 161).
Aa
White text reads best on this color (6.79:1).
About this color
#644CA1 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.132 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.053 away. White text reads best on it, at 6.79:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.132) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.09:1 |
| White text | 6.79:1 |
Values
| HEX | #644CA1 |
| RGB | rgb(100, 76, 161) |
| HSL | hsl(257, 36%, 46%) |
| OKLCH | oklch(48.3% 0.132 293.9) |
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 #644CA1 | 6.79:1 | AA | Lc -88.2 | Fine for body text |
| Black text on #644CA1 | 3.09:1 | AA large text | Lc 20.8 | Dividers and decoration only |
| #644CA1 text on white | 6.79:1 | AA | Lc 83.2 | Fine for body text |
| #644CA1 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#DAD5EF
oklch(88.5% 0.036 294.5)
-
Step 300
300
#C2B9E7
oklch(80.8% 0.065 293.9)
-
Step 400
400
#A494DB
oklch(70.7% 0.103 293.9)
-
Step 500
500
#8E78D0
oklch(63% 0.13 293.8)
-
Step 600
600
#795FBD
oklch(55.5% 0.142 294)
-
Step 700
700 (this color)
#644CA1
oklch(48.3% 0.132 293.9)
-
Step 800
800
#534184
oklch(42.8% 0.108 293.7)
-
Step 900
900
#44376A
oklch(37.6% 0.086 293.6)
-
Step 950
950
#28213E
oklch(27.1% 0.053 293.6)
#644CA1 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) | #295CA4 | 0.081 |
| Deuteranopia (no green cones) | #2E5A9F | 0.077 |
| Tritanopia (no blue cones) | #555D6F | 0.106 |
| Achromatopsia (no color) | #5B5B5B | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644CA1
#644CA1
oklch(48.3% 0.132 293.9)
- #5E6500
#5E6500
oklch(48.4% 0.109 114.4)
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 #644CA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.053
- Rebecca Purple #663399 ΔE 0.057
- Iris #6258C4 ΔE 0.059
- Blueberry #464196 ΔE 0.062
- Bluey Purple #6241C7 ΔE 0.067
- Dusk #4E5481 ΔE 0.069
- Dusky Blue #475F94 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.072
Use #644CA1 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.