#40478C
Closest named color: Blueberry (#464196). oklch(42.8% 0.113 276.2), rgb(64, 71, 140).
Aa
White text reads best on this color (8.40:1).
About this color
#40478C is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.113 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.025 away. White text reads best on it, at 8.40:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.49:1 |
| White text | 8.40:1 |
Values
| HEX | #40478C |
| RGB | rgb(64, 71, 140) |
| HSL | hsl(234, 37%, 40%) |
| OKLCH | oklch(42.8% 0.113 276.2) |
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 #40478C | 8.40:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #40478C | 2.49:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #40478C text on white | 8.40:1 | AAA | Lc 88.8 | Fine for body text |
| #40478C text on black | 2.49:1 | Fails | Lc -13.4 | 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 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
#B5BEEC
oklch(81% 0.066 276.2)
-
Step 400
400
#8F9BE2
oklch(70.8% 0.105 276)
-
Step 500
500
#7480DA
oklch(63.1% 0.135 276.1)
-
Step 600
600
#5E68C7
oklch(55.6% 0.146 276.1)
-
Step 700
700
#4E56AC
oklch(49.1% 0.136 276.2)
-
Step 800
800 (this color)
#40478C
oklch(42.8% 0.113 276.2)
-
Step 900
900
#363C70
oklch(37.8% 0.088 276.3)
-
Step 950
950
#1F2341
oklch(26.9% 0.056 276.2)
#40478C 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) | #27518F | 0.037 |
| Deuteranopia (no green cones) | #1E4A8B | 0.038 |
| Tritanopia (no blue cones) | #1E5663 | 0.098 |
| Achromatopsia (no color) | #4D4D4D | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40478C
#40478C
oklch(42.8% 0.113 276.2)
- #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 #40478C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.025
- Dark Slate Blue #483D8B ΔE 0.028
- Twilight #4E518B ΔE 0.037
- Cobalt #1E488F ΔE 0.039
- Dusk Blue #26538D ΔE 0.041
- Light Navy #155084 ΔE 0.051
- Dusk #4E5481 ΔE 0.051
- Denim Blue #3B5B92 ΔE 0.055
Use #40478C 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.