#424B8B
Closest named color: Twilight (#4E518B). oklch(43.8% 0.105 275.2), rgb(66, 75, 139).
Aa
White text reads best on this color (8.04:1).
About this color
#424B8B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.105 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.026 away. White text reads best on it, at 8.04:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.61:1 |
| White text | 8.04:1 |
Values
| HEX | #424B8B |
| RGB | rgb(66, 75, 139) |
| HSL | hsl(233, 36%, 40%) |
| OKLCH | oklch(43.8% 0.105 275.2) |
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 #424B8B | 8.04:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #424B8B | 2.61:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #424B8B text on white | 8.04:1 | AAA | Lc 87.7 | Fine for body text |
| #424B8B text on black | 2.61:1 | Fails | Lc -14.4 | 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
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B5BEE9
oklch(80.9% 0.062 275.7)
-
Step 400
400
#8F9CDE
oklch(70.8% 0.098 275.1)
-
Step 500
500
#7482D5
oklch(63.2% 0.126 275)
-
Step 600
600
#5E6AC2
oklch(55.7% 0.136 275.2)
-
Step 700
700
#4D58A8
oklch(49.2% 0.127 274.8)
-
Step 800
800 (this color)
#424B8B
oklch(43.8% 0.105 275.2)
-
Step 900
900
#353D6D
oklch(37.7% 0.082 274.6)
-
Step 950
950
#1F2440
oklch(27% 0.052 274.7)
#424B8B 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) | #30538D | 0.029 |
| Deuteranopia (no green cones) | #294D8A | 0.030 |
| Tritanopia (no blue cones) | #235964 | 0.093 |
| Achromatopsia (no color) | #505050 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B8B
#424B8B
oklch(43.8% 0.105 275.2)
- #615100
#615100
oklch(43.8% 0.09 95.9)
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 #424B8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.026
- Blueberry #464196 ΔE 0.034
- Dusk Blue #26538D ΔE 0.036
- Dark Slate Blue #483D8B ΔE 0.037
- Dusk #4E5481 ΔE 0.039
- Cobalt #1E488F ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.048
Use #424B8B 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.