#042359
Closest named color: Marine (#042E60). oklch(27.4% 0.104 260.5), rgb(4, 35, 89).
Aa
White text reads best on this color (15.10:1).
About this color
#042359 is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.104 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.034 away. White text reads best on it, at 15.10:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.38:1 |
| White text | 15.10:1 |
Values
| HEX | #042359 |
| RGB | rgb(4, 35, 89) |
| HSL | hsl(218, 91%, 18%) |
| OKLCH | oklch(27.4% 0.104 260.5) |
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 #042359 | 15.10:1 | AAA | Lc -104.4 | Preferred for body text |
| Black text on #042359 | 1.38:1 | Fails | Lc 0.0 | Not readable |
| #042359 text on white | 15.10:1 | AAA | Lc 101.5 | Preferred for body text |
| #042359 text on black | 1.38:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#679FFF
oklch(70.7% 0.153 260.6)
-
Step 500
500
#3B83FF
oklch(63.1% 0.198 260.5)
-
Step 600
600
#0065F8
oklch(55.6% 0.233 260.5)
-
Step 700
700
#0055D2
oklch(49.1% 0.205 260.4)
-
Step 800
800
#0045AF
oklch(42.8% 0.18 260.5)
-
Step 900
900
#003993
oklch(37.7% 0.158 260.5)
-
Step 950
950 (this color)
#042359
oklch(27.4% 0.104 260.5)
#042359 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) | #002A5B | 0.020 |
| Deuteranopia (no green cones) | #002258 | 0.006 |
| Tritanopia (no blue cones) | #00313A | 0.080 |
| Achromatopsia (no color) | #262626 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042359
#042359
oklch(27.4% 0.104 260.5)
- #352400
#352400
oklch(27.4% 0.056 81.9)
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 #042359, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.034
- Midnight Blue #191970 ΔE 0.050
- Darkblue #030764 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.063
- Navy Blue #001146 ΔE 0.063
- Dark Royal Blue #02066F ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.065
Use #042359 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.