#042A49
Closest named color: Oxford Blue (#1B263B). oklch(27.8% 0.07 248.3), rgb(4, 42, 73).
Aa
White text reads best on this color (14.65:1).
About this color
#042A49 is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.070 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.032 away. White text reads best on it, at 14.65:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.43:1 |
| White text | 14.65:1 |
Values
| HEX | #042A49 |
| RGB | rgb(4, 42, 73) |
| HSL | hsl(207, 90%, 15%) |
| OKLCH | oklch(27.8% 0.07 248.3) |
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 #042A49 | 14.65:1 | AAA | Lc -104.1 | Preferred for body text |
| Black text on #042A49 | 1.43:1 | Fails | Lc 0.0 | Not readable |
| #042A49 text on white | 14.65:1 | AAA | Lc 101.2 | Preferred for body text |
| #042A49 text on black | 1.43:1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECFA
oklch(93.7% 0.024 248.1)
-
Step 200
200
#C2DDF7
oklch(88.6% 0.046 247.3)
-
Step 300
300
#96C6F4
oklch(80.9% 0.083 247.8)
-
Step 400
400
#56A6EF
oklch(70.6% 0.133 248.3)
-
Step 500
500
#048EEA
oklch(63.2% 0.17 248.2)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#004475
oklch(37.8% 0.103 248.3)
-
Step 950
950 (this color)
#042A49
oklch(27.8% 0.07 248.3)
#042A49 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) | #1B2C4A | 0.024 |
| Deuteranopia (no green cones) | #102648 | 0.015 |
| Tritanopia (no blue cones) | #003136 | 0.048 |
| Achromatopsia (no color) | #282828 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042A49
#042A49
oklch(27.8% 0.07 248.3)
- #3C2200
#3C2200
oklch(28% 0.061 68.4)
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 #042A49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.032
- Marine #042E60 ΔE 0.042
- Dark #1B2431 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.051
- Gunmetal #293241 ΔE 0.056
- Midnight Green #073B4C ΔE 0.058
- Jet #212529 ΔE 0.063
Use #042A49 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.