#664DB1
Closest named color: Iris (#6258C4). oklch(49.8% 0.153 291.4), rgb(102, 77, 177).
Aa
White text reads best on this color (6.43:1).
About this color
#664DB1 is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.153 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.038 away. White text reads best on it, at 6.43:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.153) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.26:1 |
| White text | 6.43:1 |
Values
| HEX | #664DB1 |
| RGB | rgb(102, 77, 177) |
| HSL | hsl(255, 39%, 50%) |
| OKLCH | oklch(49.8% 0.153 291.4) |
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 #664DB1 | 6.43:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #664DB1 | 3.26:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #664DB1 text on white | 6.43:1 | AA | Lc 81.7 | Fine for body text |
| #664DB1 text on black | 3.26:1 | AA large text | Lc -20.2 | 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
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D9D5F3
oklch(88.5% 0.041 291.7)
-
Step 300
300
#C0B9ED
oklch(80.9% 0.073 290.8)
-
Step 400
400
#A193E4
oklch(70.7% 0.117 291)
-
Step 500
500
#8C76DC
oklch(63.2% 0.15 291.4)
-
Step 600
600
#775CCA
oklch(55.6% 0.164 291.5)
-
Step 700
700 (this color)
#664DB1
oklch(49.8% 0.153 291.4)
-
Step 800
800
#513E8D
oklch(42.6% 0.126 291.2)
-
Step 900
900
#433671
oklch(37.8% 0.098 291.1)
-
Step 950
950
#272042
oklch(27% 0.062 291.2)
#664DB1 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) | #1660B4 | 0.094 |
| Deuteranopia (no green cones) | #1D5CAF | 0.090 |
| Tritanopia (no blue cones) | #516377 | 0.125 |
| Achromatopsia (no color) | #5E5E5E | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664DB1
#664DB1
oklch(49.8% 0.153 291.4)
- #656800
#656800
oklch(49.8% 0.11 111.7)
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 #664DB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.038
- Bluey Purple #6241C7 ΔE 0.045
- Slate Blue #6A5ACD ΔE 0.052
- Light Indigo #6D5ACF ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.063
- Rebecca Purple #663399 ΔE 0.067
- Blurple #5539CC ΔE 0.069
Use #664DB1 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.