#403573
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.103 288.6), rgb(64, 53, 115).
Aa
White text reads best on this color (10.63:1).
About this color
#403573 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.103 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 10.63:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #403573 |
| RGB | rgb(64, 53, 115) |
| HSL | hsl(251, 37%, 33%) |
| OKLCH | oklch(37.4% 0.103 288.6) |
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 #403573 | 10.63:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #403573 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #403573 text on white | 10.63:1 | AAA | Lc 94.5 | Preferred for body text |
| #403573 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D7D5F4
oklch(88.4% 0.042 288.5)
-
Step 300
300
#BEB9F0
oklch(80.9% 0.077 288.7)
-
Step 400
400
#9E93E8
oklch(70.7% 0.123 288.8)
-
Step 500
500
#8876E2
oklch(63.2% 0.158 288.7)
-
Step 600
600
#735CCF
oklch(55.6% 0.171 288.8)
-
Step 700
700
#604BB4
oklch(49.1% 0.16 288.3)
-
Step 800
800
#4E3E91
oklch(42.6% 0.131 288.4)
-
Step 900
900 (this color)
#403573
oklch(37.4% 0.103 288.6)
-
Step 950
950
#262044
oklch(27% 0.065 288.9)
#403573 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) | #1A4075 | 0.055 |
| Deuteranopia (no green cones) | #1A3D72 | 0.053 |
| Tritanopia (no blue cones) | #31424E | 0.086 |
| Achromatopsia (no color) | #3E3E3E | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403573
#403573
oklch(37.4% 0.103 288.6)
- #454400
#454400
oklch(37.5% 0.081 108.8)
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 #403573, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.066
- Marine Blue #01386A ΔE 0.072
- Cobalt #1E488F ΔE 0.073
- Prussian Blue #1D3557 ΔE 0.073
- Dark Grey Blue #29465B ΔE 0.078
- Light Navy #155084 ΔE 0.084
Use #403573 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.