#424A7B
Closest named color: Dusk (#4E5481). oklch(42.5% 0.082 275.3), rgb(66, 74, 123).
Aa
White text reads best on this color (8.40:1).
About this color
#424A7B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.082 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.036 away. White text reads best on it, at 8.40:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.49:1 |
| White text | 8.40:1 |
Values
| HEX | #424A7B |
| RGB | rgb(66, 74, 123) |
| HSL | hsl(232, 30%, 37%) |
| OKLCH | oklch(42.5% 0.082 275.3) |
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 #424A7B | 8.40:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #424A7B | 2.49:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #424A7B text on white | 8.40:1 | AAA | Lc 88.9 | Fine for body text |
| #424A7B text on black | 2.49:1 | Fails | Lc -13.3 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B7BFE0
oklch(80.9% 0.047 274.6)
-
Step 400
400
#939DD1
oklch(70.7% 0.077 275.8)
-
Step 500
500
#7984C5
oklch(63.1% 0.099 275.9)
-
Step 600
600
#626DB1
oklch(55.6% 0.106 275.4)
-
Step 700
700
#515B98
oklch(49.1% 0.098 275.1)
-
Step 800
800 (this color)
#424A7B
oklch(42.5% 0.082 275.3)
-
Step 900
900
#383E63
oklch(37.6% 0.064 275.9)
-
Step 950
950
#21253A
oklch(27.1% 0.04 275.2)
#424A7B 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) | #38507D | 0.020 |
| Deuteranopia (no green cones) | #344B7A | 0.019 |
| Tritanopia (no blue cones) | #2E545C | 0.073 |
| Achromatopsia (no color) | #4D4D4D | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424A7B
#424A7B
oklch(42.5% 0.082 275.3)
- #5C4E0C
#5C4E0C
oklch(42.6% 0.082 96.1)
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 #424A7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.036
- Twilight #4E518B ΔE 0.037
- Dusk Blue #26538D ΔE 0.044
- Light Navy #155084 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.049
- YInMn Blue #415A77 ΔE 0.050
- Dusty Grape #545775 ΔE 0.053
Use #424A7B 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.