#664F9C
Closest named color: Twilight (#4E518B). oklch(48.8% 0.121 295.3), rgb(102, 79, 156).
Aa
White text reads best on this color (6.63:1).
About this color
#664F9C is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.121 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.049 away. White text reads best on it, at 6.63:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.16:1 |
| White text | 6.63:1 |
Values
| HEX | #664F9C |
| RGB | rgb(102, 79, 156) |
| HSL | hsl(258, 33%, 46%) |
| OKLCH | oklch(48.8% 0.121 295.3) |
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 #664F9C | 6.63:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #664F9C | 3.16:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #664F9C text on white | 6.63:1 | AA | Lc 82.6 | Fine for body text |
| #664F9C text on black | 3.16:1 | AA large text | Lc -19.3 | 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
#EAE8F4
oklch(93.6% 0.016 293.7)
-
Step 200
200
#DAD5ED
oklch(88.4% 0.033 295.3)
-
Step 300
300
#C3BAE3
oklch(81% 0.058 295.1)
-
Step 400
400
#A595D5
oklch(70.7% 0.093 295.4)
-
Step 500
500
#8F79CA
oklch(63% 0.121 295.2)
-
Step 600
600
#7A61B6
oklch(55.5% 0.13 295.4)
-
Step 700
700 (this color)
#664F9C
oklch(48.8% 0.121 295.3)
-
Step 800
800
#54427F
oklch(42.7% 0.099 295.5)
-
Step 900
900
#453866
oklch(37.7% 0.078 295.4)
-
Step 950
950
#28213C
oklch(26.9% 0.05 294.8)
#664F9C 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) | #345D9F | 0.073 |
| Deuteranopia (no green cones) | #395B9A | 0.068 |
| Tritanopia (no blue cones) | #5A5E6E | 0.097 |
| Achromatopsia (no color) | #5C5C5C | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664F9C
#664F9C
oklch(48.8% 0.121 295.3)
- #5E6600
#5E6600
oklch(48.7% 0.11 115)
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 #664F9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.049
- Dusk #4E5481 ΔE 0.062
- Dusky Blue #475F94 ΔE 0.063
- Iris #6258C4 ΔE 0.064
- Rebecca Purple #663399 ΔE 0.065
- Blueberry #464196 ΔE 0.068
- Denim Blue #3B5B92 ΔE 0.070
- Muted Purple #805B87 ΔE 0.071
Use #664F9C 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.