#042549
Closest named color: Oxford Blue (#1B263B). oklch(26.5% 0.077 253.9), rgb(4, 37, 73).
Aa
White text reads best on this color (15.37:1).
About this color
#042549 is a dark, moderately saturated blue. In OKLCH its lightness is 26%, its chroma 0.077 and its hue 254°. 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 15.37:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.36:1 |
| White text | 15.37:1 |
Values
| HEX | #042549 |
| RGB | rgb(4, 37, 73) |
| HSL | hsl(211, 90%, 15%) |
| OKLCH | oklch(26.5% 0.077 253.9) |
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 #042549 | 15.37:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #042549 | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #042549 text on white | 15.37:1 | AAA | Lc 102.0 | Preferred for body text |
| #042549 text on black | 1.36:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DCFB
oklch(88.6% 0.051 253.9)
-
Step 300
300
#98C4FB
oklch(80.9% 0.091 254.3)
-
Step 400
400
#5BA3F9
oklch(70.7% 0.146 254.1)
-
Step 500
500
#1F89F6
oklch(63.1% 0.186 254)
-
Step 600
600
#0072D6
oklch(55.6% 0.176 253.8)
-
Step 700
700
#0060B6
oklch(49.2% 0.156 253.8)
-
Step 800
800
#004E96
oklch(42.7% 0.135 253.8)
-
Step 900
900
#00417F
oklch(37.8% 0.12 253.9)
-
Step 950
950 (this color)
#042549
oklch(26.5% 0.077 253.9)
#042549 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) | #12284A | 0.018 |
| Deuteranopia (no green cones) | #042248 | 0.010 |
| Tritanopia (no blue cones) | #002E33 | 0.058 |
| Achromatopsia (no color) | #252525 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042549
#042549
oklch(26.5% 0.077 253.9)
- #352000
#352000
oklch(26.4% 0.056 73.6)
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 #042549, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.036
- Marine #042E60 ΔE 0.048
- Dark #1B2431 ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.061
- Navy Blue #001146 ΔE 0.061
- Rich Black #0D1B2A ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.064
- Jet #212529 ΔE 0.067
Use #042549 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.