#403673
Closest named color: Dark Slate Blue (#483D8B). oklch(37.6% 0.101 288.1), rgb(64, 54, 115).
Aa
White text reads best on this color (10.53:1).
About this color
#403673 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.101 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.045 away. White text reads best on it, at 10.53:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.99:1 |
| White text | 10.53:1 |
Values
| HEX | #403673 |
| RGB | rgb(64, 54, 115) |
| HSL | hsl(250, 36%, 33%) |
| OKLCH | oklch(37.6% 0.101 288.1) |
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 #403673 | 10.53:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #403673 | 1.99:1 | Fails | Lc 9.7 | Not readable |
| #403673 text on white | 10.53:1 | AAA | Lc 94.3 | Preferred for body text |
| #403673 text on black | 1.99:1 | Fails | Lc -8.3 | 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
#BEB9EF
oklch(80.8% 0.076 288.8)
-
Step 400
400
#9D94E8
oklch(70.8% 0.121 287.8)
-
Step 500
500
#8777E0
oklch(63.1% 0.154 288.2)
-
Step 600
600
#725DCE
oklch(55.6% 0.168 288.2)
-
Step 700
700
#604CB3
oklch(49.2% 0.157 288.2)
-
Step 800
800
#4E3F90
oklch(42.7% 0.129 288.2)
-
Step 900
900 (this color)
#403673
oklch(37.6% 0.101 288.1)
-
Step 950
950
#252044
oklch(26.9% 0.065 287.6)
#403673 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) | #1C4075 | 0.052 |
| Deuteranopia (no green cones) | #1C3D72 | 0.051 |
| Tritanopia (no blue cones) | #31434F | 0.085 |
| Achromatopsia (no color) | #3F3F3F | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403673
#403673
oklch(37.6% 0.101 288.1)
- #464400
#464400
oklch(37.6% 0.081 107.8)
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 #403673, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.045
- Blueberry #464196 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.064
- Cobalt #1E488F ΔE 0.071
- Marine Blue #01386A ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.073
- Dark Grey Blue #29465B ΔE 0.076
- Light Navy #155084 ΔE 0.082
Use #403673 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.