#644FAC
Closest named color: Iris (#6258C4). oklch(49.6% 0.143 290.6), rgb(100, 79, 172).
Aa
White text reads best on this color (6.44:1).
About this color
#644FAC is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.143 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.041 away. White text reads best on it, at 6.44:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.143) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.25:1 |
| White text | 6.44:1 |
Values
| HEX | #644FAC |
| RGB | rgb(100, 79, 172) |
| HSL | hsl(254, 37%, 49%) |
| OKLCH | oklch(49.6% 0.143 290.6) |
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 #644FAC | 6.44:1 | AA | Lc -86.9 | Fine for body text |
| Black text on #644FAC | 3.25:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #644FAC text on white | 6.44:1 | AA | Lc 81.8 | Fine for body text |
| #644FAC text on black | 3.25:1 | AA large text | Lc -20.1 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D8D5F1
oklch(88.4% 0.038 290.5)
-
Step 300
300
#C0B9EB
oklch(80.8% 0.07 291.2)
-
Step 400
400
#A094E1
oklch(70.7% 0.111 290.4)
-
Step 500
500
#8A78D8
oklch(63.1% 0.141 290.4)
-
Step 600
600
#755FC5
oklch(55.6% 0.153 290.5)
-
Step 700
700 (this color)
#644FAC
oklch(49.6% 0.143 290.6)
-
Step 800
800
#50408A
oklch(42.7% 0.118 290.4)
-
Step 900
900
#42376E
oklch(37.7% 0.092 290.5)
-
Step 950
950
#272141
oklch(27.2% 0.058 290.6)
#644FAC 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) | #2360AF | 0.083 |
| Deuteranopia (no green cones) | #275CAA | 0.079 |
| Tritanopia (no blue cones) | #506376 | 0.117 |
| Achromatopsia (no color) | #5E5E5E | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #644FAC
#644FAC
oklch(49.6% 0.143 290.6)
- #666700
#666700
oklch(49.6% 0.109 110.4)
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 #644FAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.041
- Bluey Purple #6241C7 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.061
- Twilight #4E518B ΔE 0.065
- Dark Periwinkle #665FD1 ΔE 0.066
- Rebecca Purple #663399 ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
Use #644FAC 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.