#424D8F
Closest named color: Twilight (#4E518B). oklch(44.5% 0.108 274), rgb(66, 77, 143).
Aa
White text reads best on this color (7.80:1).
About this color
#424D8F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.108 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.023 away. White text reads best on it, at 7.80:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.68:1 |
| White text | 7.80:1 |
Values
| HEX | #424D8F |
| RGB | rgb(66, 77, 143) |
| HSL | hsl(231, 37%, 41%) |
| OKLCH | oklch(44.5% 0.108 274) |
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 #424D8F | 7.80:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #424D8F | 2.68:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #424D8F text on white | 7.80:1 | AAA | Lc 86.9 | Fine for body text |
| #424D8F text on black | 2.68:1 | Fails | Lc -15.2 | Dividers and decoration only |
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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B3BEEA
oklch(80.8% 0.063 273.9)
-
Step 400
400
#8D9CE0
oklch(70.8% 0.101 274)
-
Step 500
500
#7282D7
oklch(63.1% 0.129 274.1)
-
Step 600
600
#5B6AC5
oklch(55.7% 0.141 273.9)
-
Step 700
700
#4B58AA
oklch(49.2% 0.131 273.8)
-
Step 800
800 (this color)
#424D8F
oklch(44.5% 0.108 274)
-
Step 900
900
#343D6E
oklch(37.7% 0.084 273.8)
-
Step 950
950
#1E2440
oklch(27% 0.053 273.2)
#424D8F 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) | #315591 | 0.028 |
| Deuteranopia (no green cones) | #284F8E | 0.030 |
| Tritanopia (no blue cones) | #1F5B67 | 0.095 |
| Achromatopsia (no color) | #525252 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424D8F
#424D8F
oklch(44.5% 0.108 274)
- #645200
#645200
oklch(44.4% 0.091 94.3)
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 #424D8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.023
- Dusk Blue #26538D ΔE 0.034
- Blueberry #464196 ΔE 0.035
- Dusk #4E5481 ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.045
- Cobalt #1E488F ΔE 0.045
Use #424D8F 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.