#664CB6
Closest named color: Iris (#6258C4). oklch(50% 0.161 290.7), rgb(102, 76, 182).
Aa
White text reads best on this color (6.41:1).
About this color
#664CB6 is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.161 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.034 away. White text reads best on it, at 6.41:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.161) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #664CB6 |
| RGB | rgb(102, 76, 182) |
| HSL | hsl(255, 42%, 51%) |
| OKLCH | oklch(50% 0.161 290.7) |
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 #664CB6 | 6.41:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #664CB6 | 3.27:1 | AA large text | Lc 22.5 | Dividers and decoration only |
| #664CB6 text on white | 6.41:1 | AA | Lc 81.5 | Fine for body text |
| #664CB6 text on black | 3.27:1 | AA large text | Lc -20.4 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D8D5F4
oklch(88.5% 0.042 289.9)
-
Step 300
300
#C0B8F0
oklch(80.8% 0.079 291.1)
-
Step 400
400
#A192E8
oklch(70.7% 0.124 290.9)
-
Step 500
500
#8B74E1
oklch(63% 0.159 290.8)
-
Step 600
600
#765ACF
oklch(55.5% 0.173 290.7)
-
Step 700
700 (this color)
#664CB6
oklch(50% 0.161 290.7)
-
Step 800
800
#513D91
oklch(42.7% 0.133 290.6)
-
Step 900
900
#433574
oklch(37.8% 0.104 290.8)
-
Step 950
950
#271F44
oklch(26.9% 0.067 291.2)
#664CB6 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) | #0261BA | 0.100 |
| Deuteranopia (no green cones) | #0E5CB4 | 0.096 |
| Tritanopia (no blue cones) | #4F6379 | 0.131 |
| Achromatopsia (no color) | #5F5F5F | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664CB6
#664CB6
oklch(50% 0.161 290.7)
- #676800
#676800
oklch(50% 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 #664CB6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.034
- Bluey Purple #6241C7 ΔE 0.038
- Slate Blue #6A5ACD ΔE 0.047
- Light Indigo #6D5ACF ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.059
- Blurple #5539CC ΔE 0.063
- Rebecca Purple #663399 ΔE 0.069
Use #664CB6 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.