#664EA5
Closest named color: Iris (#6258C4). oklch(49.2% 0.135 293.5), rgb(102, 78, 165).
Aa
White text reads best on this color (6.56:1).
About this color
#664EA5 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.135 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.052 away. White text reads best on it, at 6.56:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.135) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.19:1 |
| White text | 6.56:1 |
Values
| HEX | #664EA5 |
| RGB | rgb(102, 78, 165) |
| HSL | hsl(257, 36%, 48%) |
| OKLCH | oklch(49.2% 0.135 293.5) |
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 #664EA5 | 6.56:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #664EA5 | 3.19:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #664EA5 text on white | 6.56:1 | AA | Lc 82.3 | Fine for body text |
| #664EA5 text on black | 3.19:1 | AA large text | Lc -19.6 | 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
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#DAD5EF
oklch(88.5% 0.036 294.5)
-
Step 300
300
#C2B9E8
oklch(80.9% 0.066 293.6)
-
Step 400
400
#A494DC
oklch(70.8% 0.105 293.8)
-
Step 500
500
#8E78D2
oklch(63.1% 0.133 293.5)
-
Step 600
600
#795FBF
oklch(55.6% 0.145 293.6)
-
Step 700
700 (this color)
#664EA5
oklch(49.2% 0.135 293.5)
-
Step 800
800
#534086
oklch(42.7% 0.113 293.6)
-
Step 900
900
#44376B
oklch(37.7% 0.087 293.3)
-
Step 950
950
#28213F
oklch(27.1% 0.055 293.1)
#664EA5 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) | #2A5EA8 | 0.082 |
| Deuteranopia (no green cones) | #2F5CA3 | 0.078 |
| Tritanopia (no blue cones) | #566072 | 0.109 |
| Achromatopsia (no color) | #5D5D5D | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664EA5
#664EA5
oklch(49.2% 0.135 293.5)
- #616700
#616700
oklch(49.2% 0.11 113.7)
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 #664EA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.052
- Twilight #4E518B ΔE 0.059
- Rebecca Purple #663399 ΔE 0.063
- Bluey Purple #6241C7 ΔE 0.064
- Slate Blue #6A5ACD ΔE 0.067
- Blueberry #464196 ΔE 0.069
- Light Indigo #6D5ACF ΔE 0.070
- Dusky Blue #475F94 ΔE 0.071
Use #664EA5 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.