#042E49
Closest named color: Oxford Blue (#1B263B). oklch(28.9% 0.066 243), rgb(4, 46, 73).
Aa
White text reads best on this color (14.07:1).
About this color
#042E49 is a dark, muted blue. In OKLCH its lightness is 29%, its chroma 0.066 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.036 away. White text reads best on it, at 14.07:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.49:1 |
| White text | 14.07:1 |
Values
| HEX | #042E49 |
| RGB | rgb(4, 46, 73) |
| HSL | hsl(203, 90%, 15%) |
| OKLCH | oklch(28.9% 0.066 243) |
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 #042E49 | 14.07:1 | AAA | Lc -103.5 | Preferred for body text |
| Black text on #042E49 | 1.49:1 | Fails | Lc 0.0 | Not readable |
| #042E49 text on white | 14.07:1 | AAA | Lc 100.4 | Preferred for body text |
| #042E49 text on black | 1.49:1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C1DDF4
oklch(88.4% 0.044 243)
-
Step 300
300
#95C7EF
oklch(80.9% 0.077 243)
-
Step 400
400
#52A9E8
oklch(70.8% 0.125 242.8)
-
Step 500
500
#0091DD
oklch(63.1% 0.152 242.9)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466E
oklch(37.8% 0.091 242.8)
-
Step 950
950 (this color)
#042E49
oklch(28.9% 0.066 243)
#042E49 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) | #212F4A | 0.030 |
| Deuteranopia (no green cones) | #172949 | 0.021 |
| Tritanopia (no blue cones) | #003538 | 0.045 |
| Achromatopsia (no color) | #2B2B2B | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042E49
#042E49
oklch(28.9% 0.066 243)
- #422200
#422200
oklch(28.9% 0.067 61.8)
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 #042E49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.042
- Marine #042E60 ΔE 0.042
- Midnight Green #073B4C ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.045
- Gunmetal #293241 ΔE 0.047
- Dark #1B2431 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.053
Use #042E49 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.