#424389
Closest named color: Dark Slate Blue (#483D8B). oklch(42% 0.114 279.7), rgb(66, 67, 137).
Aa
White text reads best on this color (8.76:1).
About this color
#424389 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.114 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.018 away. White text reads best on it, at 8.76:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #424389 |
| RGB | rgb(66, 67, 137) |
| HSL | hsl(239, 35%, 40%) |
| OKLCH | oklch(42% 0.114 279.7) |
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 #424389 | 8.76:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #424389 | 2.39:1 | Fails | Lc 14.2 | Not readable |
| #424389 text on white | 8.76:1 | AAA | Lc 89.8 | Fine for body text |
| #424389 text on black | 2.39:1 | Fails | Lc -12.4 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D4D7F2
oklch(88.5% 0.037 280.6)
-
Step 300
300
#B7BDEC
oklch(81% 0.067 279.1)
-
Step 400
400
#9399E2
oklch(70.7% 0.107 279.7)
-
Step 500
500
#7A7EDA
oklch(63.1% 0.137 279.8)
-
Step 600
600
#6466C7
oklch(55.7% 0.147 279.6)
-
Step 700
700
#5354AC
oklch(49.1% 0.137 279.6)
-
Step 800
800 (this color)
#424389
oklch(42% 0.114 279.7)
-
Step 900
900
#393B6F
oklch(37.8% 0.088 279.7)
-
Step 950
950
#212341
oklch(27% 0.055 279.1)
#424389 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) | #224D8C | 0.043 |
| Deuteranopia (no green cones) | #1C4887 | 0.045 |
| Tritanopia (no blue cones) | #26525F | 0.099 |
| Achromatopsia (no color) | #4B4B4B | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424389
#424389
oklch(42% 0.114 279.7)
- #594D00
#594D00
oklch(41.9% 0.087 98.9)
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 #424389, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.018
- Blueberry #464196 ΔE 0.023
- Cobalt #1E488F ΔE 0.043
- Twilight #4E518B ΔE 0.045
- Dusk Blue #26538D ΔE 0.051
- Light Navy #155084 ΔE 0.057
- Dusk #4E5481 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.065
Use #424389 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.