#664BB2
Closest named color: Iris (#6258C4). oklch(49.5% 0.157 291.7), rgb(102, 75, 178).
Aa
White text reads best on this color (6.53:1).
About this color
#664BB2 is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.157 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.040 away. White text reads best on it, at 6.53:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.157) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.21:1 |
| White text | 6.53:1 |
Values
| HEX | #664BB2 |
| RGB | rgb(102, 75, 178) |
| HSL | hsl(256, 41%, 50%) |
| OKLCH | oklch(49.5% 0.157 291.7) |
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 #664BB2 | 6.53:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #664BB2 | 3.21:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #664BB2 text on white | 6.53:1 | AA | Lc 82.0 | Fine for body text |
| #664BB2 text on black | 3.21:1 | AA large text | Lc -19.8 | 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
#EAE8F8
oklch(93.7% 0.022 291.7)
-
Step 200
200
#D9D5F3
oklch(88.5% 0.041 291.7)
-
Step 300
300
#C1B8EE
oklch(80.8% 0.076 292.3)
-
Step 400
400
#A292E6
oklch(70.7% 0.121 291.7)
-
Step 500
500
#8D75DE
oklch(63.2% 0.154 291.9)
-
Step 600
600
#785BCC
oklch(55.7% 0.168 291.8)
-
Step 700
700 (this color)
#664BB2
oklch(49.5% 0.157 291.7)
-
Step 800
800
#523D8F
oklch(42.7% 0.13 291.7)
-
Step 900
900
#443572
oklch(37.7% 0.101 292.2)
-
Step 950
950
#272043
oklch(27.1% 0.064 290.7)
#664BB2 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) | #0A5FB5 | 0.099 |
| Deuteranopia (no green cones) | #165BB0 | 0.094 |
| Tritanopia (no blue cones) | #516177 | 0.126 |
| Achromatopsia (no color) | #5E5E5E | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664BB2
#664BB2
oklch(49.5% 0.157 291.7)
- #646700
#646700
oklch(49.5% 0.109 111.8)
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 #664BB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.040
- Bluey Purple #6241C7 ΔE 0.041
- Slate Blue #6A5ACD ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.057
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Rebecca Purple #663399 ΔE 0.064
- Dark Periwinkle #665FD1 ΔE 0.064
- Blurple #5539CC ΔE 0.065
Use #664BB2 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.