#42478C
Closest named color: Blueberry (#464196). oklch(43% 0.112 277.4), rgb(66, 71, 140).
Aa
White text reads best on this color (8.36:1).
About this color
#42478C is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.112 and its hue 277°. 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 8.36:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.51:1 |
| White text | 8.36:1 |
Values
| HEX | #42478C |
| RGB | rgb(66, 71, 140) |
| HSL | hsl(236, 36%, 40%) |
| OKLCH | oklch(43% 0.112 277.4) |
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 #42478C | 8.36:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #42478C | 2.51:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #42478C text on white | 8.36:1 | AAA | Lc 88.7 | Fine for body text |
| #42478C text on black | 2.51:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B6BDEB
oklch(80.9% 0.065 278.1)
-
Step 400
400
#909AE2
oklch(70.7% 0.106 277.3)
-
Step 500
500
#7680D9
oklch(63.1% 0.133 277)
-
Step 600
600
#6067C7
oklch(55.6% 0.147 277.4)
-
Step 700
700
#5055AC
oklch(49.1% 0.136 277.6)
-
Step 800
800 (this color)
#42478C
oklch(43% 0.112 277.4)
-
Step 900
900
#373C6F
oklch(37.8% 0.087 277.2)
-
Step 950
950
#202341
oklch(27% 0.056 277.7)
#42478C 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) | #28518F | 0.038 |
| Deuteranopia (no green cones) | #204B8A | 0.040 |
| Tritanopia (no blue cones) | #235663 | 0.098 |
| Achromatopsia (no color) | #4E4E4E | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42478C
#42478C
oklch(43% 0.112 277.4)
- #5D4F00
#5D4F00
oklch(42.9% 0.088 97.4)
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 #42478C, 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 0.036
- Cobalt #1E488F ΔE 0.042
- Dusk Blue #26538D ΔE 0.043
- Dusk #4E5481 ΔE 0.050
- Light Navy #155084 ΔE 0.053
- Denim Blue #3B5B92 ΔE 0.055
Use #42478C 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.