#424B7C
Closest named color: Dusk (#4E5481). oklch(42.8% 0.082 274.5), rgb(66, 75, 124).
Aa
White text reads best on this color (8.30:1).
About this color
#424B7C 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 0.034 away. White text reads best on it, at 8.30:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.52:1 |
| White text | 8.30:1 |
Values
| HEX | #424B7C |
| RGB | rgb(66, 75, 124) |
| HSL | hsl(231, 31%, 37%) |
| OKLCH | oklch(42.8% 0.082 274.5) |
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 #424B7C | 8.30:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #424B7C | 2.52:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #424B7C text on white | 8.30:1 | AAA | Lc 88.6 | Fine for body text |
| #424B7C text on black | 2.52:1 | Fails | Lc -13.6 | 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
#D3D8EB
oklch(88.4% 0.027 274.1)
-
Step 300
300
#B7BFE0
oklch(80.9% 0.047 274.6)
-
Step 400
400
#929DD1
oklch(70.6% 0.077 275)
-
Step 500
500
#7885C5
oklch(63.2% 0.098 274.5)
-
Step 600
600
#616DB1
oklch(55.5% 0.106 274.8)
-
Step 700
700
#505B98
oklch(49% 0.098 274.5)
-
Step 800
800 (this color)
#424B7C
oklch(42.8% 0.082 274.5)
-
Step 900
900
#373F63
oklch(37.7% 0.063 273.5)
-
Step 950
950
#20253A
oklch(27% 0.04 273.2)
#424B7C 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) | #39517E | 0.020 |
| Deuteranopia (no green cones) | #344C7B | 0.019 |
| Tritanopia (no blue cones) | #2E555D | 0.073 |
| Achromatopsia (no color) | #4E4E4E | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B7C
#424B7C
oklch(42.8% 0.082 274.5)
- #5E4E0C
#5E4E0C
oklch(42.8% 0.082 94.2)
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 #424B7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.034
- Twilight #4E518B ΔE 0.035
- Dusk Blue #26538D ΔE 0.042
- Light Navy #155084 ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.049
- Dusty Grape #545775 ΔE 0.051
Use #424B7C 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.