#664F9E
Closest named color: Twilight (#4E518B). oklch(48.9% 0.124 294.8), rgb(102, 79, 158).
Aa
White text reads best on this color (6.60:1).
About this color
#664F9E is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.124 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.050 away. White text reads best on it, at 6.60:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.124) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.17:1 |
| White text | 6.60:1 |
Values
| HEX | #664F9E |
| RGB | rgb(102, 79, 158) |
| HSL | hsl(257, 33%, 46%) |
| OKLCH | oklch(48.9% 0.124 294.8) |
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 #664F9E | 6.60:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #664F9E | 3.17:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #664F9E text on white | 6.60:1 | AA | Lc 82.5 | Fine for body text |
| #664F9E text on black | 3.17:1 | AA large text | Lc -19.4 | 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
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#DAD5ED
oklch(88.4% 0.033 295.3)
-
Step 300
300
#C3BAE4
oklch(81% 0.059 294.9)
-
Step 400
400
#A495D6
oklch(70.7% 0.095 294.4)
-
Step 500
500
#8F79CB
oklch(63% 0.122 295)
-
Step 600
600
#7A61B8
oklch(55.7% 0.132 295)
-
Step 700
700 (this color)
#664F9E
oklch(48.9% 0.124 294.8)
-
Step 800
800
#544281
oklch(42.9% 0.102 294.9)
-
Step 900
900
#453867
oklch(37.7% 0.079 295.1)
-
Step 950
950
#28213C
oklch(26.9% 0.05 294.8)
#664F9E 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) | #325DA1 | 0.075 |
| Deuteranopia (no green cones) | #375C9C | 0.071 |
| Tritanopia (no blue cones) | #595E6F | 0.099 |
| Achromatopsia (no color) | #5D5D5D | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664F9E
#664F9E
oklch(48.9% 0.124 294.8)
- #5F6700
#5F6700
oklch(49% 0.111 115)
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 #664F9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.050
- Iris #6258C4 ΔE 0.061
- Dusky Blue #475F94 ΔE 0.064
- Rebecca Purple #663399 ΔE 0.064
- Dusk #4E5481 ΔE 0.065
- Blueberry #464196 ΔE 0.068
- Denim Blue #3B5B92 ΔE 0.071
- Muted Purple #805B87 ΔE 0.073
Use #664F9E 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.