#664EA6
Closest named color: Iris (#6258C4). oklch(49.2% 0.136 293.3), rgb(102, 78, 166).
Aa
White text reads best on this color (6.55:1).
About this color
#664EA6 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.136 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.051 away. White text reads best on it, at 6.55:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.136) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.20:1 |
| White text | 6.55:1 |
Values
| HEX | #664EA6 |
| RGB | rgb(102, 78, 166) |
| HSL | hsl(256, 36%, 48%) |
| OKLCH | oklch(49.2% 0.136 293.3) |
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 #664EA6 | 6.55:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #664EA6 | 3.20:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #664EA6 text on white | 6.55:1 | AA | Lc 82.2 | Fine for body text |
| #664EA6 text on black | 3.20:1 | AA large text | Lc -19.7 | 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
#DAD5F0
oklch(88.5% 0.037 294.1)
-
Step 300
300
#C2B9E8
oklch(80.9% 0.066 293.6)
-
Step 400
400
#A394DC
oklch(70.7% 0.105 293.1)
-
Step 500
500
#8E78D3
oklch(63.2% 0.135 293.3)
-
Step 600
600
#795FC0
oklch(55.7% 0.146 293.4)
-
Step 700
700 (this color)
#664EA6
oklch(49.2% 0.136 293.3)
-
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)
#664EA6 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) | #295EA9 | 0.083 |
| Deuteranopia (no green cones) | #2E5CA4 | 0.079 |
| Tritanopia (no blue cones) | #566072 | 0.111 |
| Achromatopsia (no color) | #5D5D5D | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664EA6
#664EA6
oklch(49.2% 0.136 293.3)
- #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 #664EA6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.051
- Twilight #4E518B ΔE 0.060
- Bluey Purple #6241C7 ΔE 0.062
- Rebecca Purple #663399 ΔE 0.063
- Slate Blue #6A5ACD ΔE 0.065
- Light Indigo #6D5ACF ΔE 0.069
- Blueberry #464196 ΔE 0.070
- Dusky Blue #475F94 ΔE 0.071
Use #664EA6 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.