#40336E
Closest named color: Dark Slate Blue (#483D8B). oklch(36.7% 0.098 290.9), rgb(64, 51, 110).
Aa
White text reads best on this color (10.95:1).
About this color
#40336E is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.098 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 0.055 away. White text reads best on it, at 10.95:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.098) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.91:1 |
| White text | 10.95:1 |
Values
| HEX | #40336E |
| RGB | rgb(64, 51, 110) |
| HSL | hsl(253, 37%, 32%) |
| OKLCH | oklch(36.7% 0.098 290.9) |
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 #40336E | 10.95:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #40336E | 1.91:1 | Fails | Lc 8.7 | Not readable |
| #40336E text on white | 10.95:1 | AAA | Lc 95.2 | Preferred for body text |
| #40336E text on black | 1.91:1 | Fails | Lc -7.5 | 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
#D8D5F3
oklch(88.5% 0.041 290.1)
-
Step 300
300
#C0B9ED
oklch(80.9% 0.073 290.8)
-
Step 400
400
#A193E5
oklch(70.8% 0.118 290.9)
-
Step 500
500
#8B76DD
oklch(63.1% 0.151 290.8)
-
Step 600
600
#765CCA
oklch(55.5% 0.164 291)
-
Step 700
700
#634BAF
oklch(49% 0.153 290.7)
-
Step 800
800
#513E8E
oklch(42.7% 0.127 291)
-
Step 900
900 (this color)
#40336E
oklch(36.7% 0.098 290.9)
-
Step 950
950
#272042
oklch(27% 0.062 291.2)
#40336E 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) | #1B3D70 | 0.055 |
| Deuteranopia (no green cones) | #1C3B6D | 0.053 |
| Tritanopia (no blue cones) | #343F4B | 0.081 |
| Achromatopsia (no color) | #3C3C3C | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40336E
#40336E
oklch(36.7% 0.098 290.9)
- #414200
#414200
oklch(36.6% 0.08 110.7)
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 #40336E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.068
- Twilight Blue #0A437A ΔE 0.070
- Marine Blue #01386A ΔE 0.071
- Blueberry #464196 ΔE 0.074
- Dark Grey Blue #29465B ΔE 0.077
- Cobalt #1E488F ΔE 0.081
- Dark Blue Grey #1F3B4D ΔE 0.084
Use #40336E 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.