#424C88
Closest named color: Twilight (#4E518B). oklch(43.8% 0.099 274.4), rgb(66, 76, 136).
Aa
White text reads best on this color (8.01:1).
About this color
#424C88 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.099 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.024 away. White text reads best on it, at 8.01:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.62:1 |
| White text | 8.01:1 |
Values
| HEX | #424C88 |
| RGB | rgb(66, 76, 136) |
| HSL | hsl(231, 35%, 40%) |
| OKLCH | oklch(43.8% 0.099 274.4) |
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 #424C88 | 8.01:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #424C88 | 2.62:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #424C88 text on white | 8.01:1 | AAA | Lc 87.6 | Fine for body text |
| #424C88 text on black | 2.62:1 | Fails | Lc -14.5 | 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
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B5BEE7
oklch(80.8% 0.059 275.3)
-
Step 400
400
#8F9CDB
oklch(70.7% 0.094 274.8)
-
Step 500
500
#7483D1
oklch(63.2% 0.119 274.3)
-
Step 600
600
#5D6BBE
oklch(55.6% 0.129 274.2)
-
Step 700
700
#4D59A4
oklch(49.1% 0.12 274.3)
-
Step 800
800 (this color)
#424C88
oklch(43.8% 0.099 274.4)
-
Step 900
900
#353D6A
oklch(37.5% 0.078 274.4)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#424C88 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) | #34538A | 0.024 |
| Deuteranopia (no green cones) | #2D4E87 | 0.026 |
| Tritanopia (no blue cones) | #255963 | 0.089 |
| Achromatopsia (no color) | #505050 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424C88
#424C88
oklch(43.8% 0.099 274.4)
- #625000
#625000
oklch(43.7% 0.09 93.9)
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 #424C88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.024
- Dusk #4E5481 ΔE 0.034
- Dusk Blue #26538D ΔE 0.035
- Blueberry #464196 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.044
- Cobalt #1E488F ΔE 0.046
Use #424C88 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.