#424B85
Closest named color: Twilight (#4E518B). oklch(43.4% 0.096 275), rgb(66, 75, 133).
Aa
White text reads best on this color (8.14:1).
About this color
#424B85 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.096 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.027 away. White text reads best on it, at 8.14:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.57:1 |
| White text | 8.14:1 |
Values
| HEX | #424B85 |
| RGB | rgb(66, 75, 133) |
| HSL | hsl(232, 34%, 39%) |
| OKLCH | oklch(43.4% 0.096 275) |
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 #424B85 | 8.14:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #424B85 | 2.57:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #424B85 text on white | 8.14:1 | AAA | Lc 88.1 | Fine for body text |
| #424B85 text on black | 2.57:1 | Fails | Lc -14.1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D3D8EE
oklch(88.5% 0.031 275.6)
-
Step 300
300
#B6BEE6
oklch(80.9% 0.057 276.2)
-
Step 400
400
#909CD9
oklch(70.6% 0.09 275.3)
-
Step 500
500
#7683CE
oklch(63.1% 0.114 275.2)
-
Step 600
600
#5F6BBB
oklch(55.5% 0.124 275.2)
-
Step 700
700
#4E59A2
oklch(49.1% 0.117 274.8)
-
Step 800
800 (this color)
#424B85
oklch(43.4% 0.096 275)
-
Step 900
900
#363E69
oklch(37.8% 0.074 274.3)
-
Step 950
950
#20243D
oklch(26.9% 0.047 275.9)
#424B85 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) | #345287 | 0.025 |
| Deuteranopia (no green cones) | #2E4D84 | 0.025 |
| Tritanopia (no blue cones) | #285761 | 0.085 |
| Achromatopsia (no color) | #4F4F4F | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B85
#424B85
oklch(43.4% 0.096 275)
- #605000
#605000
oklch(43.5% 0.089 95.7)
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 #424B85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.027
- Dusk #4E5481 ΔE 0.035
- Dusk Blue #26538D ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.046
- Light Navy #155084 ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.046
Use #424B85 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.