#424B7A
Closest named color: Dusk (#4E5481). oklch(42.7% 0.079 274.4), rgb(66, 75, 122).
Aa
White text reads best on this color (8.33:1).
About this color
#424B7A is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.079 and its hue 274°. 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 8.33:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.51:1 |
| White text | 8.33:1 |
Values
| HEX | #424B7A |
| RGB | rgb(66, 75, 122) |
| HSL | hsl(230, 30%, 37%) |
| OKLCH | oklch(42.7% 0.079 274.4) |
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 #424B7A | 8.33:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #424B7A | 2.51:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #424B7A text on white | 8.33:1 | AAA | Lc 88.7 | Fine for body text |
| #424B7A text on black | 2.51:1 | Fails | Lc -13.5 | 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
#B7BFDF
oklch(80.9% 0.046 274.3)
-
Step 400
400
#929ECF
oklch(70.8% 0.073 273.7)
-
Step 500
500
#7885C3
oklch(63.1% 0.095 274.3)
-
Step 600
600
#616EAF
oklch(55.6% 0.102 274)
-
Step 700
700
#515C96
oklch(49.2% 0.094 274.3)
-
Step 800
800 (this color)
#424B7A
oklch(42.7% 0.079 274.4)
-
Step 900
900
#383F62
oklch(37.8% 0.061 274.5)
-
Step 950
950
#212539
oklch(27% 0.038 274.9)
#424B7A 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) | #3A507C | 0.017 |
| Deuteranopia (no green cones) | #354C79 | 0.018 |
| Tritanopia (no blue cones) | #2F555C | 0.071 |
| Achromatopsia (no color) | #4E4E4E | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B7A
#424B7A
oklch(42.7% 0.079 274.4)
- #5D4E11
#5D4E11
oklch(42.7% 0.079 94.5)
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 #424B7A, 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 0.037
- Dusk Blue #26538D ΔE 0.044
- Light Navy #155084 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.047
- Dusty Grape #545775 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.052
Use #424B7A 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.