#424C7F
Closest named color: Twilight (#4E518B). oklch(43.2% 0.085 273.9), rgb(66, 76, 127).
Aa
White text reads best on this color (8.16:1).
About this color
#424C7F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.085 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.030 away. White text reads best on it, at 8.16:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.57:1 |
| White text | 8.16:1 |
Values
| HEX | #424C7F |
| RGB | rgb(66, 76, 127) |
| HSL | hsl(230, 32%, 38%) |
| OKLCH | oklch(43.2% 0.085 273.9) |
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 #424C7F | 8.16:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #424C7F | 2.57:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #424C7F text on white | 8.16:1 | AAA | Lc 88.2 | Fine for body text |
| #424C7F text on black | 2.57:1 | Fails | Lc -14.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B6BFE2
oklch(80.9% 0.05 273.9)
-
Step 400
400
#919DD3
oklch(70.7% 0.08 274.5)
-
Step 500
500
#7684C7
oklch(63% 0.102 274.1)
-
Step 600
600
#5F6DB4
oklch(55.6% 0.111 273.8)
-
Step 700
700
#4F5B9B
oklch(49.1% 0.103 274)
-
Step 800
800 (this color)
#424C7F
oklch(43.2% 0.085 273.9)
-
Step 900
900
#373E65
oklch(37.6% 0.067 275)
-
Step 950
950
#20253B
oklch(27.1% 0.042 273.5)
#424C7F 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) | #395281 | 0.019 |
| Deuteranopia (no green cones) | #344D7E | 0.019 |
| Tritanopia (no blue cones) | #2C575F | 0.077 |
| Achromatopsia (no color) | #4F4F4F | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424C7F
#424C7F
oklch(43.2% 0.085 273.9)
- #604F07
#604F07
oklch(43.3% 0.085 94)
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 #424C7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.030
- Dusk #4E5481 ΔE 0.031
- Dusk Blue #26538D ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.043
- Light Navy #155084 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.049
Use #424C7F 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.