#664FA4
Closest named color: Iris (#6258C4). oklch(49.3% 0.132 293.4), rgb(102, 79, 164).
Aa
White text reads best on this color (6.52:1).
About this color
#664FA4 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.132 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.053 away. White text reads best on it, at 6.52:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.132) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.21:1 |
| White text | 6.52:1 |
Values
| HEX | #664FA4 |
| RGB | rgb(102, 79, 164) |
| HSL | hsl(256, 35%, 48%) |
| OKLCH | oklch(49.3% 0.132 293.4) |
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 #664FA4 | 6.52:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #664FA4 | 3.21:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #664FA4 text on white | 6.52:1 | AA | Lc 82.1 | Fine for body text |
| #664FA4 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#DAD5EF
oklch(88.5% 0.036 294.5)
-
Step 300
300
#C2B9E7
oklch(80.8% 0.065 293.9)
-
Step 400
400
#A394DB
oklch(70.6% 0.103 293.3)
-
Step 500
500
#8E78D0
oklch(63% 0.13 293.8)
-
Step 600
600
#7860BD
oklch(55.6% 0.141 293.2)
-
Step 700
700 (this color)
#664FA4
oklch(49.3% 0.132 293.4)
-
Step 800
800
#534184
oklch(42.8% 0.108 293.7)
-
Step 900
900
#44376A
oklch(37.6% 0.086 293.6)
-
Step 950
950
#28213E
oklch(27.1% 0.053 293.6)
#664FA4 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) | #2D5FA7 | 0.080 |
| Deuteranopia (no green cones) | #325CA2 | 0.075 |
| Tritanopia (no blue cones) | #576072 | 0.106 |
| Achromatopsia (no color) | #5E5E5E | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664FA4
#664FA4
oklch(49.3% 0.132 293.4)
- #626700
#626700
oklch(49.3% 0.11 113.1)
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 #664FA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.053
- Twilight #4E518B ΔE 0.057
- Rebecca Purple #663399 ΔE 0.065
- Bluey Purple #6241C7 ΔE 0.066
- Slate Blue #6A5ACD ΔE 0.067
- Dusky Blue #475F94 ΔE 0.068
- Blueberry #464196 ΔE 0.070
- Light Indigo #6D5ACF ΔE 0.071
Use #664FA4 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.