#40367D
Closest named color: Dark Slate Blue (#483D8B). oklch(38.3% 0.116 286), rgb(64, 54, 125).
Aa
White text reads best on this color (10.28:1).
About this color
#40367D is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.116 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 10.28:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.04:1 |
| White text | 10.28:1 |
Values
| HEX | #40367D |
| RGB | rgb(64, 54, 125) |
| HSL | hsl(248, 40%, 35%) |
| OKLCH | oklch(38.3% 0.116 286) |
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 #40367D | 10.28:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #40367D | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #40367D text on white | 10.28:1 | AAA | Lc 93.6 | Preferred for body text |
| #40367D text on black | 2.04:1 | Fails | Lc -8.9 | 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 900.
-
Step 50
50
#F4F4FD
oklch(97% 0.012 286.2)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D6D5F8
oklch(88.5% 0.048 286.7)
-
Step 300
300
#BBB9F7
oklch(80.9% 0.087 285.8)
-
Step 400
400
#9A92F3
oklch(70.7% 0.139 286)
-
Step 500
500
#8374EE
oklch(63.1% 0.177 285.8)
-
Step 600
600
#6F58DC
oklch(55.5% 0.193 286.3)
-
Step 700
700
#5D47BF
oklch(49% 0.179 286.1)
-
Step 800
800
#4C3C9B
oklch(42.8% 0.148 286)
-
Step 900
900 (this color)
#40367D
oklch(38.3% 0.116 286)
-
Step 950
950
#241F48
oklch(26.9% 0.074 285.9)
#40367D 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) | #0F427F | 0.060 |
| Deuteranopia (no green cones) | #0C3E7B | 0.061 |
| Tritanopia (no blue cones) | #2C4654 | 0.097 |
| Achromatopsia (no color) | #414141 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40367D
#40367D
oklch(38.3% 0.116 286)
- #494500
#494500
oklch(38.2% 0.081 105.9)
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 #40367D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.050
- Cobalt #1E488F ΔE 0.063
- Twilight Blue #0A437A ΔE 0.065
- Marine Blue #01386A ΔE 0.078
- Light Navy #155084 ΔE 0.080
- Twilight #4E518B ΔE 0.080
- Dusk Blue #26538D ΔE 0.082
Use #40367D 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.