#664CA5
Closest named color: Iris (#6258C4). oklch(48.8% 0.138 294.2), rgb(102, 76, 165).
Aa
White text reads best on this color (6.68:1).
About this color
#664CA5 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.138 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.054 away. White text reads best on it, at 6.68:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.138) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.14:1 |
| White text | 6.68:1 |
Values
| HEX | #664CA5 |
| RGB | rgb(102, 76, 165) |
| HSL | hsl(258, 37%, 47%) |
| OKLCH | oklch(48.8% 0.138 294.2) |
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 #664CA5 | 6.68:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #664CA5 | 3.14:1 | AA large text | Lc 21.3 | Dividers and decoration only |
| #664CA5 text on white | 6.68:1 | AA | Lc 82.8 | Fine for body text |
| #664CA5 text on black | 3.14:1 | AA large text | Lc -19.2 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#DAD5F0
oklch(88.5% 0.037 294.1)
-
Step 300
300
#C2B9E8
oklch(80.9% 0.066 293.6)
-
Step 400
400
#A493DD
oklch(70.6% 0.108 294)
-
Step 500
500
#8F77D3
oklch(63.1% 0.136 294.2)
-
Step 600
600
#7A5EC0
oklch(55.6% 0.148 294.3)
-
Step 700
700 (this color)
#664CA5
oklch(48.8% 0.138 294.2)
-
Step 800
800
#543F86
oklch(42.6% 0.114 294.7)
-
Step 900
900
#45376C
oklch(37.8% 0.089 293.9)
-
Step 950
950
#28203F
oklch(26.9% 0.057 294.1)
#664CA5 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) | #265DA8 | 0.086 |
| Deuteranopia (no green cones) | #2C5BA3 | 0.082 |
| Tritanopia (no blue cones) | #565E71 | 0.110 |
| Achromatopsia (no color) | #5C5C5C | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664CA5
#664CA5
oklch(48.8% 0.138 294.2)
- #5F6600
#5F6600
oklch(48.7% 0.11 114.4)
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 #664CA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.054
- Rebecca Purple #663399 ΔE 0.058
- Twilight #4E518B ΔE 0.060
- Bluey Purple #6241C7 ΔE 0.061
- Blueberry #464196 ΔE 0.067
- Slate Blue #6A5ACD ΔE 0.069
- Light Indigo #6D5ACF ΔE 0.072
- Dusky Blue #475F94 ΔE 0.074
Use #664CA5 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.