#66699C
Closest named color: Dull Blue (#49759C). oklch(53.9% 0.08 280.8), rgb(102, 105, 156).
Aa
White text reads best on this color (5.16:1).
About this color
#66699C is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.080 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.047 away. White text reads best on it, at 5.16:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.06:1 |
| White text | 5.16:1 |
Values
| HEX | #66699C |
| RGB | rgb(102, 105, 156) |
| HSL | hsl(237, 21%, 51%) |
| OKLCH | oklch(53.9% 0.08 280.8) |
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 #66699C | 5.16:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #66699C | 4.06:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #66699C text on white | 5.16:1 | AA | Lc 75.5 | Fine for body text |
| #66699C text on black | 4.06:1 | AA large text | Lc -26.2 | 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 600.
-
Step 50
50
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E8E9F1
oklch(93.6% 0.011 280.5)
-
Step 200
200
#D6D8E6
oklch(88.5% 0.019 279.5)
-
Step 300
300
#BCBED8
oklch(80.8% 0.037 282.1)
-
Step 400
400
#9A9DC4
oklch(70.7% 0.057 281.4)
-
Step 500
500
#8185B5
oklch(63.2% 0.072 280.4)
-
Step 600
600 (this color)
#66699C
oklch(53.9% 0.08 280.8)
-
Step 700
700
#595C8A
oklch(49.2% 0.073 280.5)
-
Step 800
800
#494B70
oklch(42.7% 0.061 281.1)
-
Step 900
900
#3D3F5B
oklch(37.8% 0.048 280.7)
-
Step 950
950
#242535
oklch(27.1% 0.03 281.4)
#66699C 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) | #596F9E | 0.023 |
| Deuteranopia (no green cones) | #576B9B | 0.021 |
| Tritanopia (no blue cones) | #58737B | 0.071 |
| Achromatopsia (no color) | #6D6D6D | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66699C
#66699C
oklch(53.9% 0.08 280.8)
- #797036
#797036
oklch(54% 0.079 100.6)
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 #66699C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.047
- Dark Lavender #856798 ΔE 0.049
- French Blue #436BAD ΔE 0.049
- Metallic Blue #4F738E ΔE 0.050
- Muted Blue #3B719F ΔE 0.053
- Grey Purple #826D8C ΔE 0.053
- Flat Blue #3C73A8 ΔE 0.054
- Dusty Purple #825F87 ΔE 0.055
Use #66699C 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.