#403566
Closest named color: Prussian Blue (#1D3557). oklch(36.5% 0.083 292.1), rgb(64, 53, 102).
Aa
White text reads best on this color (10.94:1).
About this color
#403566 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.083 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.060 away. White text reads best on it, at 10.94:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.083) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #403566 |
| RGB | rgb(64, 53, 102) |
| HSL | hsl(253, 32%, 30%) |
| OKLCH | oklch(36.5% 0.083 292.1) |
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 #403566 | 10.94:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #403566 | 1.91:1 | Fails | Lc 8.7 | Not readable |
| #403566 text on white | 10.94:1 | AAA | Lc 95.2 | Preferred for body text |
| #403566 text on black | 1.91:1 | Fails | Lc -7.4 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#D9D5EF
oklch(88.4% 0.036 292.7)
-
Step 300
300
#C1BAE6
oklch(80.9% 0.062 292.3)
-
Step 400
400
#A295DA
oklch(70.7% 0.1 292.3)
-
Step 500
500
#8C7ACF
oklch(63.2% 0.126 292.1)
-
Step 600
600
#7661BC
oklch(55.5% 0.138 291.9)
-
Step 700
700
#6450A2
oklch(49.1% 0.128 292.3)
-
Step 800
800
#514284
oklch(42.7% 0.107 291.7)
-
Step 900
900 (this color)
#403566
oklch(36.5% 0.083 292.1)
-
Step 950
950
#27213E
oklch(27% 0.053 291.9)
#403566 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) | #243D68 | 0.045 |
| Deuteranopia (no green cones) | #263C65 | 0.042 |
| Tritanopia (no blue cones) | #373E48 | 0.068 |
| Achromatopsia (no color) | #3D3D3D | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403566
#403566
oklch(36.5% 0.083 292.1)
- #404200
#404200
oklch(36.5% 0.081 111.7)
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 #403566, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.066
- Marine Blue #01386A ΔE 0.070
- Twilight Blue #0A437A ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.072
- Space Cadet #2B2D42 ΔE 0.076
- Onyx #343A40 ΔE 0.076
Use #403566 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.