#40387F
Closest named color: Dark Slate Blue (#483D8B). oklch(38.9% 0.116 284.8), rgb(64, 56, 127).
Aa
White text reads best on this color (10.04:1).
About this color
#40387F is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.116 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.027 away. White text reads best on it, at 10.04:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.04:1 |
Values
| HEX | #40387F |
| RGB | rgb(64, 56, 127) |
| HSL | hsl(247, 39%, 36%) |
| OKLCH | oklch(38.9% 0.116 284.8) |
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 #40387F | 10.04:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #40387F | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #40387F text on white | 10.04:1 | AAA | Lc 93.1 | Preferred for body text |
| #40387F text on black | 2.09:1 | Fails | Lc -9.4 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FB
oklch(93.6% 0.026 283.5)
-
Step 200
200
#D5D5F9
oklch(88.4% 0.049 285.3)
-
Step 300
300
#BAB9F7
oklch(80.8% 0.087 285)
-
Step 400
400
#9893F3
oklch(70.7% 0.138 284.7)
-
Step 500
500
#8174EF
oklch(63.1% 0.178 284.9)
-
Step 600
600
#6C59DD
oklch(55.5% 0.193 284.8)
-
Step 700
700
#5B48C0
oklch(49.1% 0.18 284.9)
-
Step 800
800
#4A3C9B
oklch(42.7% 0.148 284.9)
-
Step 900
900 (this color)
#40387F
oklch(38.9% 0.116 284.8)
-
Step 950
950
#232048
oklch(27% 0.072 283.9)
#40387F 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) | #124481 | 0.057 |
| Deuteranopia (no green cones) | #0E407D | 0.058 |
| Tritanopia (no blue cones) | #2A4856 | 0.098 |
| Achromatopsia (no color) | #424242 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40387F
#40387F
oklch(38.9% 0.116 284.8)
- #4C4600
#4C4600
oklch(38.8% 0.082 104)
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 #40387F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.027
- Blueberry #464196 ΔE 0.045
- Cobalt #1E488F ΔE 0.058
- Twilight Blue #0A437A ΔE 0.063
- Twilight #4E518B ΔE 0.075
- Light Navy #155084 ΔE 0.075
- Dusk Blue #26538D ΔE 0.077
- Marine Blue #01386A ΔE 0.079
Use #40387F 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.