#665A9D
Closest named color: Dusky Blue (#475F94). oklch(50.9% 0.104 290.4), rgb(102, 90, 157).
Aa
White text reads best on this color (5.97:1).
About this color
#665A9D is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.104 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.049 away. White text reads best on it, at 5.97:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.104) |
| Temperature | in between |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.51:1 |
| White text | 5.97:1 |
Values
| HEX | #665A9D |
| RGB | rgb(102, 90, 157) |
| HSL | hsl(251, 27%, 48%) |
| OKLCH | oklch(50.9% 0.104 290.4) |
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 #665A9D | 5.97:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #665A9D | 3.51:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #665A9D text on white | 5.97:1 | AA | Lc 79.8 | Fine for body text |
| #665A9D text on black | 3.51:1 | AA large text | Lc -22.0 | 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
#E9E8F3
oklch(93.5% 0.015 290.3)
-
Step 200
200
#D8D6EB
oklch(88.4% 0.029 290.2)
-
Step 300
300
#C0BCE0
oklch(81% 0.05 290.3)
-
Step 400
400
#A098D0
oklch(70.7% 0.081 290.7)
-
Step 500
500
#897EC3
oklch(63.1% 0.103 290.5)
-
Step 600
600
#7366B0
oklch(55.5% 0.113 290.3)
-
Step 700
700 (this color)
#665A9D
oklch(50.9% 0.104 290.4)
-
Step 800
800
#4F467B
oklch(42.8% 0.086 290.1)
-
Step 900
900
#413B63
oklch(37.7% 0.067 289.6)
-
Step 950
950
#26233A
oklch(27.1% 0.042 289.2)
#665A9D 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) | #4565A0 | 0.051 |
| Deuteranopia (no green cones) | #45629B | 0.049 |
| Tritanopia (no blue cones) | #586774 | 0.088 |
| Achromatopsia (no color) | #636363 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665A9D
#665A9D
oklch(50.9% 0.104 290.4)
- #696B12
#696B12
oklch(51% 0.105 111)
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 #665A9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.049
- Twilight #4E518B ΔE 0.054
- Muted Purple #805B87 ΔE 0.057
- Dusk #4E5481 ΔE 0.061
- French Blue #436BAD ΔE 0.062
- Iris #6258C4 ΔE 0.063
- Dusty Purple #825F87 ΔE 0.063
- Denim Blue #3B5B92 ΔE 0.063
Use #665A9D 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.