#403668
Closest named color: Dark Slate Blue (#483D8B). oklch(36.9% 0.084 290.9), rgb(64, 54, 104).
Aa
White text reads best on this color (10.79:1).
About this color
#403668 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.084 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.062 away. White text reads best on it, at 10.79:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.084) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.79:1 |
Values
| HEX | #403668 |
| RGB | rgb(64, 54, 104) |
| HSL | hsl(252, 32%, 31%) |
| OKLCH | oklch(36.9% 0.084 290.9) |
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 #403668 | 10.79:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #403668 | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #403668 text on white | 10.79:1 | AAA | Lc 94.9 | Preferred for body text |
| #403668 text on black | 1.94:1 | Fails | Lc -7.7 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D9D6EF
oklch(88.6% 0.034 291.2)
-
Step 300
300
#C0BAE7
oklch(80.9% 0.063 291)
-
Step 400
400
#A095DB
oklch(70.6% 0.101 290.8)
-
Step 500
500
#8A7AD1
oklch(63.1% 0.129 290.7)
-
Step 600
600
#7561BE
oklch(55.6% 0.14 291)
-
Step 700
700
#6250A4
oklch(49.1% 0.13 290.7)
-
Step 800
800
#504285
oklch(42.7% 0.108 290.7)
-
Step 900
900 (this color)
#403668
oklch(36.9% 0.084 290.9)
-
Step 950
950
#27213E
oklch(27% 0.053 291.9)
#403668 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) | #253E6A | 0.043 |
| Deuteranopia (no green cones) | #263C67 | 0.041 |
| Tritanopia (no blue cones) | #36404A | 0.070 |
| Achromatopsia (no color) | #3D3D3D | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403668
#403668
oklch(36.9% 0.084 290.9)
- #424300
#424300
oklch(37% 0.081 110.7)
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 #403668, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.065
- Twilight Blue #0A437A ΔE 0.068
- Marine Blue #01386A ΔE 0.070
- Dark Blue Grey #1F3B4D ΔE 0.073
- Charcoal #264653 ΔE 0.077
- Onyx #343A40 ΔE 0.078
Use #403668 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.