#664ECC
Closest named color: Iris (#6258C4). oklch(51.9% 0.186 286.7), rgb(102, 78, 204).
Aa
White text reads best on this color (5.95:1).
About this color
#664ECC is a medium-dark, vivid purple. In OKLCH its lightness is 52%, its chroma 0.186 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.027 away. White text reads best on it, at 5.95:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.186) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.52:1 |
| White text | 5.95:1 |
Values
| HEX | #664ECC |
| RGB | rgb(102, 78, 204) |
| HSL | hsl(251, 55%, 55%) |
| OKLCH | oklch(51.9% 0.186 286.7) |
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 #664ECC | 5.95:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #664ECC | 3.52:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #664ECC text on white | 5.95:1 | AA | Lc 79.3 | Fine for body text |
| #664ECC text on black | 3.52:1 | AA large text | Lc -22.5 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D6D5F9
oklch(88.5% 0.049 286.6)
-
Step 300
300
#BCB8F9
oklch(80.9% 0.091 287)
-
Step 400
400
#9B91F5
oklch(70.7% 0.144 286.7)
-
Step 500
500
#8572F1
oklch(63.2% 0.183 286.8)
-
Step 600
600
#7056E0
oklch(55.6% 0.2 286.6)
-
Step 700
700 (this color)
#664ECC
oklch(51.9% 0.186 286.7)
-
Step 800
800
#4D3A9D
oklch(42.8% 0.154 286.8)
-
Step 900
900
#3F337D
oklch(37.7% 0.12 286.5)
-
Step 950
950
#251F49
oklch(27.1% 0.075 286.8)
#664ECC 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) | #0067D0 | 0.097 |
| Deuteranopia (no green cones) | #0060C9 | 0.095 |
| Tritanopia (no blue cones) | #416C86 | 0.154 |
| Achromatopsia (no color) | #646464 | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664ECC
#664ECC
oklch(51.9% 0.186 286.7)
- #716C00
#716C00
oklch(51.9% 0.111 106.5)
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 #664ECC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.027
- Slate Blue #6A5ACD ΔE 0.029
- Bluey Purple #6241C7 ΔE 0.030
- Light Indigo #6D5ACF ΔE 0.031
- Dark Periwinkle #665FD1 ΔE 0.039
- Warm Blue #4B57DB ΔE 0.047
- Blue With A Hint Of Purple #533CC6 ΔE 0.053
- Blurple #5539CC ΔE 0.054
Use #664ECC 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.