#644F9C
Closest named color: Twilight (#4E518B). oklch(48.6% 0.121 294), rgb(100, 79, 156).
Aa
White text reads best on this color (6.68:1).
About this color
#644F9C is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.121 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.046 away. White text reads best on it, at 6.68:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.14:1 |
| White text | 6.68:1 |
Values
| HEX | #644F9C |
| RGB | rgb(100, 79, 156) |
| HSL | hsl(256, 33%, 46%) |
| OKLCH | oklch(48.6% 0.121 294) |
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 #644F9C | 6.68:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #644F9C | 3.14:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #644F9C text on white | 6.68:1 | AA | Lc 82.8 | Fine for body text |
| #644F9C text on black | 3.14:1 | AA large text | Lc -19.1 | 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
#F5F4FA
oklch(97% 0.008 293.9)
-
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
#C2BAE3
oklch(80.9% 0.058 294)
-
Step 400
400
#A395D6
oklch(70.6% 0.095 293.7)
-
Step 500
500
#8E7ACA
oklch(63.1% 0.119 294.2)
-
Step 600
600
#7862B7
oklch(55.6% 0.129 293.7)
-
Step 700
700 (this color)
#644F9C
oklch(48.6% 0.121 294)
-
Step 800
800
#534280
oklch(42.7% 0.101 294.4)
-
Step 900
900
#443867
oklch(37.6% 0.079 294)
-
Step 950
950
#28213C
oklch(26.9% 0.05 294.8)
#644F9C 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) | #335D9F | 0.071 |
| Deuteranopia (no green cones) | #375B9A | 0.067 |
| Tritanopia (no blue cones) | #575E6E | 0.097 |
| Achromatopsia (no color) | #5C5C5C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644F9C
#644F9C
oklch(48.6% 0.121 294)
- #5F6500
#5F6500
oklch(48.5% 0.109 113.8)
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 #644F9C, closest first.
No curated palette has a color within ΔE 0.04 of #644F9C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.046
- Dusk #4E5481 ΔE 0.060
- Dusky Blue #475F94 ΔE 0.061
- Iris #6258C4 ΔE 0.064
- Rebecca Purple #663399 ΔE 0.064
- Blueberry #464196 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.068
- Muted Purple #805B87 ΔE 0.073
Use #644F9C 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.