#424B78
Closest named color: Dusk (#4E5481). oklch(42.6% 0.076 274.2), rgb(66, 75, 120).
Aa
White text reads best on this color (8.36:1).
About this color
#424B78 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.076 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.035 away. White text reads best on it, at 8.36:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.50:1 |
| White text | 8.36:1 |
Values
| HEX | #424B78 |
| RGB | rgb(66, 75, 120) |
| HSL | hsl(230, 29%, 36%) |
| OKLCH | oklch(42.6% 0.076 274.2) |
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 #424B78 | 8.36:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #424B78 | 2.50:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #424B78 text on white | 8.36:1 | AAA | Lc 88.8 | Fine for body text |
| #424B78 text on black | 2.50:1 | 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
#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
#B7BFDE
oklch(80.8% 0.045 273.9)
-
Step 400
400
#939ECD
oklch(70.8% 0.07 274.3)
-
Step 500
500
#7885C0
oklch(63% 0.09 274)
-
Step 600
600
#626EAD
oklch(55.6% 0.099 274.5)
-
Step 700
700
#515C94
oklch(49.1% 0.091 274.2)
-
Step 800
800 (this color)
#424B78
oklch(42.6% 0.076 274.2)
-
Step 900
900
#383F61
oklch(37.7% 0.059 274.4)
-
Step 950
950
#212539
oklch(27% 0.038 274.9)
#424B78 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) | #3B507A | 0.016 |
| Deuteranopia (no green cones) | #374C77 | 0.015 |
| Tritanopia (no blue cones) | #30545C | 0.066 |
| Achromatopsia (no color) | #4E4E4E | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B78
#424B78
oklch(42.6% 0.076 274.2)
- #5C4E15
#5C4E15
oklch(42.7% 0.076 94.9)
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 #424B78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.035
- Twilight #4E518B ΔE 0.039
- Dusk Blue #26538D ΔE 0.046
- YInMn Blue #415A77 ΔE 0.046
- Light Navy #155084 ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.048
- Dusty Grape #545775 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.054
Use #424B78 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.