#424C78
Closest named color: Dusk (#4E5481). oklch(42.8% 0.074 273.2), rgb(66, 76, 120).
Aa
White text reads best on this color (8.27:1).
About this color
#424C78 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.074 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.033 away. White text reads best on it, at 8.27:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.53:1 |
| White text | 8.27:1 |
Values
| HEX | #424C78 |
| RGB | rgb(66, 76, 120) |
| HSL | hsl(229, 29%, 36%) |
| OKLCH | oklch(42.8% 0.074 273.2) |
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 #424C78 | 8.27:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #424C78 | 2.53:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #424C78 text on white | 8.27:1 | AAA | Lc 88.5 | Fine for body text |
| #424C78 text on black | 2.53:1 | Fails | Lc -13.7 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EA
oklch(88.5% 0.025 275.9)
-
Step 300
300
#B7BFDD
oklch(80.8% 0.043 273.6)
-
Step 400
400
#929ECD
oklch(70.7% 0.07 273.4)
-
Step 500
500
#7886BF
oklch(63.2% 0.088 273.1)
-
Step 600
600
#616FAC
oklch(55.7% 0.096 273.1)
-
Step 700
700
#505C93
oklch(49% 0.09 273.3)
-
Step 800
800 (this color)
#424C78
oklch(42.8% 0.074 273.2)
-
Step 900
900
#373F60
oklch(37.6% 0.058 272.9)
-
Step 950
950
#202538
oklch(26.9% 0.036 272.4)
#424C78 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) | #3C517A | 0.016 |
| Deuteranopia (no green cones) | #384C77 | 0.014 |
| Tritanopia (no blue cones) | #30555C | 0.066 |
| Achromatopsia (no color) | #4E4E4E | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424C78
#424C78
oklch(42.8% 0.074 273.2)
- #5D4E18
#5D4E18
oklch(42.8% 0.074 93.3)
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 #424C78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.033
- Twilight #4E518B ΔE 0.038
- YInMn Blue #415A77 ΔE 0.043
- Dusk Blue #26538D ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.046
- Dusty Grape #545775 ΔE 0.046
- Light Navy #155084 ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.054
Use #424C78 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.