#664E98
Closest named color: Twilight (#4E518B). oklch(48.3% 0.117 296.8), rgb(102, 78, 152).
Aa
White text reads best on this color (6.75:1).
About this color
#664E98 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.117 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.045 away. White text reads best on it, at 6.75:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.117) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.10:1 |
| White text | 6.75:1 |
Values
| HEX | #664E98 |
| RGB | rgb(102, 78, 152) |
| HSL | hsl(259, 32%, 45%) |
| OKLCH | oklch(48.3% 0.117 296.8) |
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 #664E98 | 6.75:1 | AA | Lc -88.1 | Fine for body text |
| Black text on #664E98 | 3.10:1 | AA large text | Lc 20.9 | Dividers and decoration only |
| #664E98 text on white | 6.75:1 | AA | Lc 83.1 | Fine for body text |
| #664E98 text on black | 3.10:1 | AA large text | Lc -18.8 | 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
#F6F4FA
oklch(97% 0.008 301.4)
-
Step 100
100
#EBE8F4
oklch(93.7% 0.016 297.5)
-
Step 200
200
#DBD5EC
oklch(88.5% 0.032 297.7)
-
Step 300
300
#C4BAE2
oklch(81% 0.057 296.6)
-
Step 400
400
#A695D3
oklch(70.7% 0.091 296.6)
-
Step 500
500
#917AC7
oklch(63.2% 0.115 296.7)
-
Step 600
600
#7B61B3
oklch(55.5% 0.126 296.7)
-
Step 700
700 (this color)
#664E98
oklch(48.3% 0.117 296.8)
-
Step 800
800
#55427D
oklch(42.7% 0.097 297)
-
Step 900
900
#463865
oklch(37.7% 0.076 296.9)
-
Step 950
950
#29213B
oklch(27% 0.048 297.2)
#664E98 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) | #355C9B | 0.073 |
| Deuteranopia (no green cones) | #3A5A96 | 0.068 |
| Tritanopia (no blue cones) | #5B5C6C | 0.092 |
| Achromatopsia (no color) | #5B5B5B | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664E98
#664E98
oklch(48.3% 0.117 296.8)
- #5B6600
#5B6600
oklch(48.4% 0.111 116.9)
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 #664E98, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.045
- Dusk #4E5481 ΔE 0.058
- Dusky Blue #475F94 ΔE 0.063
- Rebecca Purple #663399 ΔE 0.063
- Blueberry #464196 ΔE 0.067
- Muted Purple #805B87 ΔE 0.070
- Denim Blue #3B5B92 ΔE 0.070
- Light Eggplant #894585 ΔE 0.070
Use #664E98 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.