#424A75
Closest named color: Dusk (#4E5481). oklch(42.2% 0.072 274.9), rgb(66, 74, 117).
Aa
White text reads best on this color (8.50:1).
About this color
#424A75 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.072 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.039 away. White text reads best on it, at 8.50:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.46:1 |
| White text | 8.50:1 |
Values
| HEX | #424A75 |
| RGB | rgb(66, 74, 117) |
| HSL | hsl(231, 28%, 36%) |
| OKLCH | oklch(42.2% 0.072 274.9) |
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 #424A75 | 8.50:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #424A75 | 2.46:1 | Fails | Lc 14.8 | Not readable |
| #424A75 text on white | 8.50:1 | AAA | Lc 89.2 | Fine for body text |
| #424A75 text on black | 2.46:1 | Fails | Lc -13.0 | 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
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D4D8E9
oklch(88.4% 0.024 275.3)
-
Step 300
300
#B8BFDD
oklch(80.9% 0.043 275)
-
Step 400
400
#949ECB
oklch(70.7% 0.067 274.8)
-
Step 500
500
#7A85BE
oklch(63% 0.087 275.2)
-
Step 600
600
#636EAA
oklch(55.5% 0.094 275)
-
Step 700
700
#525C92
oklch(49.1% 0.087 274.8)
-
Step 800
800 (this color)
#424A75
oklch(42.2% 0.072 274.9)
-
Step 900
900
#393F60
oklch(37.7% 0.057 275.4)
-
Step 950
950
#212538
oklch(27% 0.036 274.6)
#424A75 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) | #3B4F77 | 0.016 |
| Deuteranopia (no green cones) | #374B74 | 0.016 |
| Tritanopia (no blue cones) | #32535A | 0.064 |
| Achromatopsia (no color) | #4D4D4D | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424A75
#424A75
oklch(42.2% 0.072 274.9)
- #5A4D18
#5A4D18
oklch(42.2% 0.073 95.2)
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 #424A75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.039
- Twilight #4E518B ΔE 0.044
- YInMn Blue #415A77 ΔE 0.048
- Light Navy #155084 ΔE 0.050
- Dusk Blue #26538D ΔE 0.050
- Dusty Grape #545775 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.056
Use #424A75 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.