#424C77
Closest named color: Dusk (#4E5481). oklch(42.8% 0.073 273), rgb(66, 76, 119).
Aa
White text reads best on this color (8.29:1).
About this color
#424C77 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.073 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.033 away. White text reads best on it, at 8.29:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #424C77 |
| RGB | rgb(66, 76, 119) |
| HSL | hsl(229, 29%, 36%) |
| OKLCH | oklch(42.8% 0.073 273) |
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 #424C77 | 8.29:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #424C77 | 2.53:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #424C77 text on white | 8.29:1 | AAA | Lc 88.6 | Fine for body text |
| #424C77 text on black | 2.53:1 | 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
#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
#B7BFDD
oklch(80.8% 0.043 273.6)
-
Step 400
400
#929ECC
oklch(70.6% 0.069 273.2)
-
Step 500
500
#7886BE
oklch(63.1% 0.086 272.9)
-
Step 600
600
#616FAB
oklch(55.6% 0.095 273)
-
Step 700
700
#505D92
oklch(49.1% 0.087 272.4)
-
Step 800
800 (this color)
#424C77
oklch(42.8% 0.073 273)
-
Step 900
900
#383F60
oklch(37.7% 0.057 274.2)
-
Step 950
950
#212538
oklch(27% 0.036 274.6)
#424C77 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) | #3D5179 | 0.015 |
| Deuteranopia (no green cones) | #384C76 | 0.014 |
| Tritanopia (no blue cones) | #30555C | 0.065 |
| Achromatopsia (no color) | #4E4E4E | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424C77
#424C77
oklch(42.8% 0.073 273)
- #5D4E1A
#5D4E1A
oklch(42.8% 0.072 92.9)
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 #424C77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.033
- Twilight #4E518B ΔE 0.040
- YInMn Blue #415A77 ΔE 0.043
- Dusty Grape #545775 ΔE 0.046
- Dusk Blue #26538D ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.047
- Light Navy #155084 ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.054
Use #424C77 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.