#403B66
Closest named color: Dark Grey Blue (#29465B). oklch(37.8% 0.072 287.7), rgb(64, 59, 102).
Aa
White text reads best on this color (10.31:1).
About this color
#403B66 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.072 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.053 away. White text reads best on it, at 10.31:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.03:1 |
| White text | 10.31:1 |
Values
| HEX | #403B66 |
| RGB | rgb(64, 59, 102) |
| HSL | hsl(247, 27%, 32%) |
| OKLCH | oklch(37.8% 0.072 287.7) |
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 #403B66 | 10.31:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #403B66 | 2.03:1 | Fails | Lc 10.0 | Not readable |
| #403B66 text on white | 10.31:1 | AAA | Lc 93.9 | Preferred for body text |
| #403B66 text on black | 2.03:1 | Fails | Lc -8.7 | Not readable |
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 900.
-
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
#D7D6ED
oklch(88.4% 0.031 287.7)
-
Step 300
300
#BEBCE2
oklch(80.9% 0.053 287.6)
-
Step 400
400
#9D98D4
oklch(70.6% 0.087 287.8)
-
Step 500
500
#867EC9
oklch(63.1% 0.111 287.7)
-
Step 600
600
#7066B5
oklch(55.5% 0.12 287.6)
-
Step 700
700
#5E559C
oklch(49.2% 0.111 287.4)
-
Step 800
800
#4D457F
oklch(42.7% 0.094 288.1)
-
Step 900
900 (this color)
#403B66
oklch(37.8% 0.072 287.7)
-
Step 950
950
#25233C
oklch(27.1% 0.046 286.6)
#403B66 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) | #2D4168 | 0.031 |
| Deuteranopia (no green cones) | #2D3F65 | 0.030 |
| Tritanopia (no blue cones) | #36434B | 0.062 |
| Achromatopsia (no color) | #404040 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B66
#403B66
oklch(37.8% 0.072 287.7)
- #46440E
#46440E
oklch(37.7% 0.072 107.3)
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 #403B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.064
- Charcoal #264653 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.067
- Onyx #343A40 ΔE 0.071
- Marine Blue #01386A ΔE 0.071
Use #403B66 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.