#042C40
Closest named color: Oxford Blue (#1B263B). oklch(27.8% 0.056 236.1), rgb(4, 44, 64).
Aa
White text reads best on this color (14.58:1).
About this color
#042C40 is a dark, muted blue. In OKLCH its lightness is 28%, its chroma 0.056 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.028 away. White text reads best on it, at 14.58:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.43:1 |
| White text | 14.58:1 |
Values
| HEX | #042C40 |
| RGB | rgb(4, 44, 64) |
| HSL | hsl(200, 88%, 13%) |
| OKLCH | oklch(27.8% 0.056 236.1) |
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 #042C40 | 14.58:1 | AAA | Lc -104.1 | Preferred for body text |
| Black text on #042C40 | 1.43:1 | Fails | Lc 0.0 | Not readable |
| #042C40 text on white | 14.58:1 | AAA | Lc 101.1 | Preferred for body text |
| #042C40 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DEECF5
oklch(93.5% 0.019 235.7)
-
Step 200
200
#C3DEEF
oklch(88.6% 0.037 235.5)
-
Step 300
300
#98C8E6
oklch(80.9% 0.066 236.1)
-
Step 400
400
#58ABDA
oklch(70.8% 0.106 235.8)
-
Step 500
500
#0294D0
oklch(63.1% 0.136 236.3)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950 (this color)
#042C40
oklch(27.8% 0.056 236.1)
#042C40 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) | #222C41 | 0.032 |
| Deuteranopia (no green cones) | #1A2640 | 0.027 |
| Tritanopia (no blue cones) | #003133 | 0.035 |
| Achromatopsia (no color) | #292929 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042C40
#042C40
oklch(27.8% 0.056 236.1)
- #3D2009
#3D2009
oklch(27.8% 0.056 55.8)
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 #042C40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.028
- Dark #1B2431 ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.047
- Gunmetal #293241 ΔE 0.049
- Jet #212529 ΔE 0.049
- Midnight Green #073B4C ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.056
- Marine #042E60 ΔE 0.058
Use #042C40 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.