#042B5C
Closest named color: Marine (#042E60). oklch(29.6% 0.097 256.8), rgb(4, 43, 92).
Aa
White text reads best on this color (13.95:1).
About this color
#042B5C is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.097 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.011 away. White text reads best on it, at 13.95:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.50:1 |
| White text | 13.95:1 |
Values
| HEX | #042B5C |
| RGB | rgb(4, 43, 92) |
| HSL | hsl(213, 92%, 19%) |
| OKLCH | oklch(29.6% 0.097 256.8) |
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 #042B5C | 13.95:1 | AAA | Lc -103.3 | Preferred for body text |
| Black text on #042B5C | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #042B5C text on white | 13.95:1 | AAA | Lc 100.2 | Preferred for body text |
| #042B5C text on black | 1.50:1 | 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
#DDEBFF
oklch(93.6% 0.031 257.2)
-
Step 200
200
#C2DBFF
oklch(88.5% 0.057 257.5)
-
Step 300
300
#98C3FF
oklch(80.9% 0.097 256.8)
-
Step 400
400
#5DA1FF
oklch(70.7% 0.155 256.9)
-
Step 500
500
#2486FF
oklch(63.2% 0.2 256.7)
-
Step 600
600
#006EE2
oklch(55.6% 0.196 256.8)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800
#004B9F
oklch(42.7% 0.151 256.9)
-
Step 900
900
#003E86
oklch(37.6% 0.133 257)
-
Step 950
950 (this color)
#042B5C
oklch(29.6% 0.097 256.8)
#042B5C 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) | #0C305E | 0.018 |
| Deuteranopia (no green cones) | #00285B | 0.010 |
| Tritanopia (no blue cones) | #00373F | 0.073 |
| Achromatopsia (no color) | #2C2C2C | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042B5C
#042B5C
oklch(29.6% 0.097 256.8)
- #3E2800
#3E2800
oklch(29.6% 0.062 77)
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 #042B5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.011
- Prussian Blue #1D3557 ΔE 0.043
- Marine Blue #01386A ΔE 0.044
- Midnight Blue #191970 ΔE 0.057
- Oxford Blue #1B263B ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.065
- Midnight Green #073B4C ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.070
Use #042B5C 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.