#40366E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.3% 0.093 289.3), rgb(64, 54, 110).
Aa
White text reads best on this color (10.65:1).
About this color
#40366E is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.093 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.053 away. White text reads best on it, at 10.65:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #40366E |
| RGB | rgb(64, 54, 110) |
| HSL | hsl(251, 34%, 32%) |
| OKLCH | oklch(37.3% 0.093 289.3) |
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 #40366E | 10.65:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #40366E | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #40366E text on white | 10.65:1 | AAA | Lc 94.6 | Preferred for body text |
| #40366E text on black | 1.97:1 | Fails | Lc -8.0 | 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
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D8D5F2
oklch(88.4% 0.04 290.3)
-
Step 300
300
#BFBAEC
oklch(81% 0.07 289.3)
-
Step 400
400
#9F94E2
oklch(70.6% 0.113 289.7)
-
Step 500
500
#8878DA
oklch(63.1% 0.144 289.1)
-
Step 600
600
#735FC7
oklch(55.6% 0.156 289.2)
-
Step 700
700
#614EAC
oklch(49.2% 0.144 289.3)
-
Step 800
800
#4F408B
oklch(42.6% 0.12 289.5)
-
Step 900
900 (this color)
#40366E
oklch(37.3% 0.093 289.3)
-
Step 950
950
#262141
oklch(27.1% 0.058 289.1)
#40366E 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) | #203F70 | 0.048 |
| Deuteranopia (no green cones) | #213D6D | 0.046 |
| Tritanopia (no blue cones) | #33414C | 0.078 |
| Achromatopsia (no color) | #3E3E3E | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40366E
#40366E
oklch(37.3% 0.093 289.3)
- #444300
#444300
oklch(37.2% 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 #40366E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.053
- Twilight Blue #0A437A ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.068
- Marine Blue #01386A ΔE 0.071
- Dark Grey Blue #29465B ΔE 0.071
- Blueberry #464196 ΔE 0.071
- Cobalt #1E488F ΔE 0.076
- Dark Blue Grey #1F3B4D ΔE 0.081
Use #40366E 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.