#664EB7
Closest named color: Iris (#6258C4). oklch(50.4% 0.159 290), rgb(102, 78, 183).
Aa
White text reads best on this color (6.29:1).
About this color
#664EB7 is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.159 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.030 away. White text reads best on it, at 6.29:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.159) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.33:1 |
| White text | 6.29:1 |
Values
| HEX | #664EB7 |
| RGB | rgb(102, 78, 183) |
| HSL | hsl(254, 42%, 51%) |
| OKLCH | oklch(50.4% 0.159 290) |
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 #664EB7 | 6.29:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #664EB7 | 3.33:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #664EB7 text on white | 6.29:1 | AA | Lc 81.0 | Fine for body text |
| #664EB7 text on black | 3.33:1 | AA large text | Lc -20.9 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D8D5F4
oklch(88.5% 0.042 289.9)
-
Step 300
300
#BFB9F0
oklch(80.9% 0.077 289.6)
-
Step 400
400
#A092E8
oklch(70.6% 0.124 290.3)
-
Step 500
500
#8A75E1
oklch(63.1% 0.158 290.1)
-
Step 600
600
#755BCE
oklch(55.6% 0.171 290.1)
-
Step 700
700 (this color)
#664EB7
oklch(50.4% 0.159 290)
-
Step 800
800
#503D91
oklch(42.6% 0.133 290)
-
Step 900
900
#423573
oklch(37.6% 0.103 290.2)
-
Step 950
950
#262044
oklch(27% 0.065 288.9)
#664EB7 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) | #0B62BB | 0.096 |
| Deuteranopia (no green cones) | #135EB5 | 0.093 |
| Tritanopia (no blue cones) | #4E657B | 0.130 |
| Achromatopsia (no color) | #606060 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664EB7
#664EB7
oklch(50.4% 0.159 290)
- #696900
#696900
oklch(50.4% 0.11 109.8)
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 #664EB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.030
- Bluey Purple #6241C7 ΔE 0.040
- Slate Blue #6A5ACD ΔE 0.043
- Light Indigo #6D5ACF ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Blurple #5539CC ΔE 0.065
- Warm Blue #4B57DB ΔE 0.069
Use #664EB7 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.