#042A66
Closest named color: Marine (#042E60). oklch(30.2% 0.114 259.8), rgb(4, 42, 102).
Aa
White text reads best on this color (13.74:1).
About this color
#042A66 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.114 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.016 away. White text reads best on it, at 13.74:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.52:1 |
| White text | 13.74:1 |
Values
| HEX | #042A66 |
| RGB | rgb(4, 42, 102) |
| HSL | hsl(217, 92%, 21%) |
| OKLCH | oklch(30.2% 0.114 259.8) |
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 #042A66 | 13.74:1 | AAA | Lc -102.9 | Preferred for body text |
| Black text on #042A66 | 1.52:1 | Fails | Lc 0.0 | Not readable |
| #042A66 text on white | 13.74:1 | AAA | Lc 99.8 | Preferred for body text |
| #042A66 text on black | 1.52:1 | 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
#C4DBFF
oklch(88.6% 0.056 259.3)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#659FFF
oklch(70.6% 0.154 260)
-
Step 500
500
#3783FF
oklch(63% 0.199 259.9)
-
Step 600
600
#0067F3
oklch(55.5% 0.225 259.9)
-
Step 700
700
#0057CE
oklch(49.2% 0.198 259.7)
-
Step 800
800
#0046AB
oklch(42.6% 0.173 259.9)
-
Step 900
900
#003A90
oklch(37.6% 0.152 259.9)
-
Step 950
950 (this color)
#042A66
oklch(30.2% 0.114 259.8)
#042A66 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) | #003268 | 0.023 |
| Deuteranopia (no green cones) | #002965 | 0.005 |
| Tritanopia (no blue cones) | #003943 | 0.086 |
| Achromatopsia (no color) | #2D2D2D | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042A66
#042A66
oklch(30.2% 0.114 259.8)
- #3F2A00
#3F2A00
oklch(30.3% 0.063 79.3)
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 #042A66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.016
- Marine Blue #01386A ΔE 0.041
- Midnight Blue #191970 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.052
- Dark Royal Blue #02066F ΔE 0.073
- Darkblue #030764 ΔE 0.076
- Deep Blue #040273 ΔE 0.076
- Midnight Green #073B4C ΔE 0.078
Use #042A66 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.