#424789
Closest named color: Dark Slate Blue (#483D8B). oklch(42.8% 0.108 277.5), rgb(66, 71, 137).
Aa
White text reads best on this color (8.41:1).
About this color
#424789 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.108 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.028 away. White text reads best on it, at 8.41:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.49:1 |
| White text | 8.41:1 |
Values
| HEX | #424789 |
| RGB | rgb(66, 71, 137) |
| HSL | hsl(236, 35%, 40%) |
| OKLCH | oklch(42.8% 0.108 277.5) |
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 #424789 | 8.41:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #424789 | 2.49:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #424789 text on white | 8.41:1 | AAA | Lc 88.9 | Fine for body text |
| #424789 text on black | 2.49:1 | Fails | Lc -13.3 | 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
#D3D8F1
oklch(88.6% 0.035 276.7)
-
Step 300
300
#B6BDEA
oklch(80.8% 0.064 277.9)
-
Step 400
400
#919ADF
oklch(70.6% 0.101 277.8)
-
Step 500
500
#7780D6
oklch(63% 0.129 277.5)
-
Step 600
600
#6168C3
oklch(55.6% 0.139 277.5)
-
Step 700
700
#5056A9
oklch(49.1% 0.131 277.3)
-
Step 800
800 (this color)
#424789
oklch(42.8% 0.108 277.5)
-
Step 900
900
#373C6D
oklch(37.7% 0.083 277.2)
-
Step 950
950
#202340
oklch(26.9% 0.054 277.6)
#424789 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) | #2A508B | 0.035 |
| Deuteranopia (no green cones) | #234B88 | 0.037 |
| Tritanopia (no blue cones) | #255561 | 0.095 |
| Achromatopsia (no color) | #4D4D4D | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424789
#424789
oklch(42.8% 0.108 277.5)
- #5D4F00
#5D4F00
oklch(42.9% 0.088 97.4)
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 #424789, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.028
- Blueberry #464196 ΔE 0.028
- Twilight #4E518B ΔE 0.035
- Cobalt #1E488F ΔE 0.042
- Dusk Blue #26538D ΔE 0.043
- Dusk #4E5481 ΔE 0.047
- Light Navy #155084 ΔE 0.051
- Denim Blue #3B5B92 ΔE 0.056
Use #424789 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.