#665BA0
Closest named color: Dusky Blue (#475F94). oklch(51.3% 0.107 289.4), rgb(102, 91, 160).
Aa
White text reads best on this color (5.88:1).
About this color
#665BA0 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.107 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.050 away. White text reads best on it, at 5.88:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.56:1 |
| White text | 5.88:1 |
Values
| HEX | #665BA0 |
| RGB | rgb(102, 91, 160) |
| HSL | hsl(250, 27%, 49%) |
| OKLCH | oklch(51.3% 0.107 289.4) |
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 #665BA0 | 5.88:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #665BA0 | 3.56:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #665BA0 text on white | 5.88:1 | AA | Lc 79.3 | Fine for body text |
| #665BA0 text on black | 3.56:1 | AA large text | Lc -22.5 | 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#E9E8F4
oklch(93.5% 0.016 289.9)
-
Step 200
200
#D8D6EC
oklch(88.4% 0.03 289.9)
-
Step 300
300
#BFBCE1
oklch(81% 0.052 288.9)
-
Step 400
400
#9F98D1
oklch(70.6% 0.083 289.7)
-
Step 500
500
#887EC5
oklch(63.1% 0.106 289.5)
-
Step 600
600
#7266B2
oklch(55.5% 0.116 289.3)
-
Step 700
700 (this color)
#665BA0
oklch(51.3% 0.107 289.4)
-
Step 800
800
#4E467C
oklch(42.8% 0.088 288.9)
-
Step 900
900
#413B64
oklch(37.8% 0.069 289.4)
-
Step 950
950
#26233A
oklch(27.1% 0.042 289.2)
#665BA0 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) | #4466A3 | 0.051 |
| Deuteranopia (no green cones) | #45639E | 0.049 |
| Tritanopia (no blue cones) | #576876 | 0.089 |
| Achromatopsia (no color) | #646464 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BA0
#665BA0
oklch(51.3% 0.107 289.4)
- #6C6B0C
#6C6B0C
oklch(51.2% 0.107 109)
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 #665BA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.050
- Twilight #4E518B ΔE 0.057
- Muted Purple #805B87 ΔE 0.059
- Iris #6258C4 ΔE 0.059
- French Blue #436BAD ΔE 0.059
- Dusty Purple #825F87 ΔE 0.065
- Dusk #4E5481 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.065
Use #665BA0 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.