#664CAA
Closest named color: Iris (#6258C4). oklch(49.1% 0.145 293.1), rgb(102, 76, 170).
Aa
White text reads best on this color (6.60:1).
About this color
#664CAA is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.145 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.047 away. White text reads best on it, at 6.60:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.145) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.17:1 |
| White text | 6.60:1 |
Values
| HEX | #664CAA |
| RGB | rgb(102, 76, 170) |
| HSL | hsl(257, 38%, 48%) |
| OKLCH | oklch(49.1% 0.145 293.1) |
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 #664CAA | 6.60:1 | AA | Lc -87.5 | Fine for body text |
| Black text on #664CAA | 3.17:1 | AA large text | Lc 21.6 | Dividers and decoration only |
| #664CAA text on white | 6.60:1 | AA | Lc 82.4 | Fine for body text |
| #664CAA text on black | 3.17:1 | AA large text | Lc -19.5 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F7
oklch(93.7% 0.02 292.1)
-
Step 200
200
#D9D5F1
oklch(88.5% 0.038 292.2)
-
Step 300
300
#C2B9EA
oklch(81% 0.069 293.2)
-
Step 400
400
#A393E0
oklch(70.7% 0.112 292.9)
-
Step 500
500
#8E76D7
oklch(63.1% 0.143 293.2)
-
Step 600
600
#795DC5
oklch(55.7% 0.156 293.1)
-
Step 700
700 (this color)
#664CAA
oklch(49.1% 0.145 293.1)
-
Step 800
800
#533F8A
oklch(42.8% 0.12 292.9)
-
Step 900
900
#44366E
oklch(37.7% 0.093 292.9)
-
Step 950
950
#282040
oklch(27% 0.059 293.6)
#664CAA 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) | #1F5EAD | 0.091 |
| Deuteranopia (no green cones) | #265BA8 | 0.086 |
| Tritanopia (no blue cones) | #546073 | 0.118 |
| Achromatopsia (no color) | #5D5D5D | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664CAA
#664CAA
oklch(49.1% 0.145 293.1)
- #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 #664CAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.047
- Bluey Purple #6241C7 ΔE 0.054
- Rebecca Purple #663399 ΔE 0.060
- Slate Blue #6A5ACD ΔE 0.062
- Light Indigo #6D5ACF ΔE 0.066
- Twilight #4E518B ΔE 0.066
- Blue With A Hint Of Purple #533CC6 ΔE 0.068
- Blueberry #464196 ΔE 0.070
Use #664CAA 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.