#40478D
Closest named color: Blueberry (#464196). oklch(42.9% 0.114 276.2), rgb(64, 71, 141).
Aa
White text reads best on this color (8.38:1).
About this color
#40478D is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.114 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.024 away. White text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.50:1 |
| White text | 8.38:1 |
Values
| HEX | #40478D |
| RGB | rgb(64, 71, 141) |
| HSL | hsl(235, 38%, 40%) |
| OKLCH | oklch(42.9% 0.114 276.2) |
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 #40478D | 8.38:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #40478D | 2.50:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #40478D text on white | 8.38:1 | AAA | Lc 88.7 | Fine for body text |
| #40478D text on black | 2.50:1 | Fails | Lc -13.5 | 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 800.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F2
oklch(88.6% 0.036 275.3)
-
Step 300
300
#B4BEEC
oklch(80.9% 0.066 275.3)
-
Step 400
400
#8F9AE3
oklch(70.6% 0.107 276.7)
-
Step 500
500
#7480DB
oklch(63.1% 0.137 276.1)
-
Step 600
600
#5E67C8
oklch(55.5% 0.149 276.4)
-
Step 700
700
#4E56AD
oklch(49.2% 0.137 276.2)
-
Step 800
800 (this color)
#40478D
oklch(42.9% 0.114 276.2)
-
Step 900
900
#363C70
oklch(37.8% 0.088 276.3)
-
Step 950
950
#1F2342
oklch(26.9% 0.058 276.3)
#40478D 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) | #265190 | 0.037 |
| Deuteranopia (no green cones) | #1D4A8B | 0.039 |
| Tritanopia (no blue cones) | #1C5663 | 0.100 |
| Achromatopsia (no color) | #4D4D4D | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40478D
#40478D
oklch(42.9% 0.114 276.2)
- #5E4F00
#5E4F00
oklch(43% 0.089 96.5)
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 #40478D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.024
- Dark Slate Blue #483D8B ΔE 0.027
- Twilight #4E518B ΔE 0.038
- Cobalt #1E488F ΔE 0.039
- Dusk Blue #26538D ΔE 0.041
- Light Navy #155084 ΔE 0.051
- Dusk #4E5481 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.055
Use #40478D 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.