#40366A
Closest named color: Dark Slate Blue (#483D8B). oklch(37% 0.087 290.3), rgb(64, 54, 106).
Aa
White text reads best on this color (10.74:1).
About this color
#40366A is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.087 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.059 away. White text reads best on it, at 10.74:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.087) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #40366A |
| RGB | rgb(64, 54, 106) |
| HSL | hsl(252, 33%, 31%) |
| OKLCH | oklch(37% 0.087 290.3) |
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 #40366A | 10.74:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #40366A | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #40366A text on white | 10.74:1 | AAA | Lc 94.8 | Preferred for body text |
| #40366A text on black | 1.95:1 | Fails | Lc -7.8 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D8D6F0
oklch(88.6% 0.036 289.2)
-
Step 300
300
#C0BAE9
oklch(81% 0.066 290.7)
-
Step 400
400
#A095DD
oklch(70.7% 0.104 290.5)
-
Step 500
500
#8A79D4
oklch(63.1% 0.134 290.6)
-
Step 600
600
#7460C1
oklch(55.5% 0.146 290.3)
-
Step 700
700
#624FA7
oklch(49.1% 0.136 290.4)
-
Step 800
800
#504187
oklch(42.7% 0.113 290.7)
-
Step 900
900 (this color)
#40366A
oklch(37% 0.087 290.3)
-
Step 950
950
#26213F
oklch(26.9% 0.055 289.9)
#40366A 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) | #233F6C | 0.046 |
| Deuteranopia (no green cones) | #243D69 | 0.044 |
| Tritanopia (no blue cones) | #35404B | 0.071 |
| Achromatopsia (no color) | #3E3E3E | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40366A
#40366A
oklch(37% 0.087 290.3)
- #424300
#424300
oklch(37% 0.081 110.7)
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 #40366A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.067
- Marine Blue #01386A ΔE 0.070
- Dark Blue Grey #1F3B4D ΔE 0.076
- Blueberry #464196 ΔE 0.077
- Charcoal #264653 ΔE 0.079
Use #40366A 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.