#40407D
Closest named color: Dark Slate Blue (#483D8B). oklch(40.3% 0.1 280.9), rgb(64, 64, 125).
Aa
White text reads best on this color (9.34:1).
About this color
#40407D is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.100 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 9.34:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.24:1 |
| White text | 9.34:1 |
Values
| HEX | #40407D |
| RGB | rgb(64, 64, 125) |
| HSL | hsl(240, 32%, 37%) |
| OKLCH | oklch(40.3% 0.1 280.9) |
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 #40407D | 9.34:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #40407D | 2.24:1 | Fails | Lc 12.5 | Not readable |
| #40407D text on white | 9.34:1 | AAA | Lc 91.4 | Preferred for body text |
| #40407D text on black | 2.24:1 | Fails | Lc -10.9 | 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 800.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D5D7EF
oklch(88.5% 0.033 281.9)
-
Step 300
300
#B9BDE7
oklch(80.9% 0.059 280.7)
-
Step 400
400
#969ADA
oklch(70.7% 0.093 281)
-
Step 500
500
#7D80D0
oklch(63.2% 0.119 280.8)
-
Step 600
600
#6768BD
oklch(55.7% 0.13 280.8)
-
Step 700
700
#5656A3
oklch(49.1% 0.121 281)
-
Step 800
800 (this color)
#40407D
oklch(40.3% 0.1 280.9)
-
Step 900
900
#3B3C6A
oklch(37.8% 0.078 281.1)
-
Step 950
950
#22233E
oklch(26.9% 0.05 280.9)
#40407D 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) | #26497F | 0.039 |
| Deuteranopia (no green cones) | #22447C | 0.039 |
| Tritanopia (no blue cones) | #2B4D58 | 0.087 |
| Achromatopsia (no color) | #474747 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40407D
#40407D
oklch(40.3% 0.1 280.9)
- #534900
#534900
oklch(40.3% 0.084 100.4)
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 #40407D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Blueberry #464196 ΔE 0.043
- Cobalt #1E488F ΔE 0.049
- Twilight Blue #0A437A ΔE 0.056
- Twilight #4E518B ΔE 0.057
- Light Navy #155084 ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Dusk #4E5481 ΔE 0.063
Use #40407D 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.