#664DAB
Closest named color: Iris (#6258C4). oklch(49.4% 0.145 292.6), rgb(102, 77, 171).
Aa
White text reads best on this color (6.53:1).
About this color
#664DAB 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 0.045 away. White text reads best on it, at 6.53:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.145) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.21:1 |
| White text | 6.53:1 |
Values
| HEX | #664DAB |
| RGB | rgb(102, 77, 171) |
| HSL | hsl(256, 38%, 49%) |
| OKLCH | oklch(49.4% 0.145 292.6) |
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 #664DAB | 6.53:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #664DAB | 3.21:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #664DAB text on white | 6.53:1 | AA | Lc 82.1 | Fine for body text |
| #664DAB 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
#EAE8F7
oklch(93.7% 0.02 292.1)
-
Step 200
200
#D9D5F1
oklch(88.5% 0.038 292.2)
-
Step 300
300
#C1B9EB
oklch(80.9% 0.07 292.1)
-
Step 400
400
#A393E0
oklch(70.7% 0.112 292.9)
-
Step 500
500
#8D76D8
oklch(63% 0.144 292.6)
-
Step 600
600
#785DC5
oklch(55.6% 0.156 292.6)
-
Step 700
700 (this color)
#664DAB
oklch(49.4% 0.145 292.6)
-
Step 800
800
#523F8A
oklch(42.7% 0.12 292.2)
-
Step 900
900
#44366E
oklch(37.7% 0.093 292.9)
-
Step 950
950
#282041
oklch(27% 0.06 293.1)
#664DAB 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) | #215FAE | 0.089 |
| Deuteranopia (no green cones) | #275CA9 | 0.084 |
| Tritanopia (no blue cones) | #546174 | 0.118 |
| Achromatopsia (no color) | #5E5E5E | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664DAB
#664DAB
oklch(49.4% 0.145 292.6)
- #636700
#636700
oklch(49.4% 0.11 112.4)
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 #664DAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.045
- Bluey Purple #6241C7 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.060
- Rebecca Purple #663399 ΔE 0.063
- Light Indigo #6D5ACF ΔE 0.063
- Twilight #4E518B ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
- Dark Periwinkle #665FD1 ΔE 0.070
Use #664DAB 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.