#04243D
Closest named color: Oxford Blue (#1B263B). oklch(25.3% 0.06 246.5), rgb(4, 36, 61).
Aa
White text reads best on this color (15.85:1).
About this color
#04243D is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.060 and its hue 247°. 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 15.85:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.85:1 |
Values
| HEX | #04243D |
| RGB | rgb(4, 36, 61) |
| HSL | hsl(206, 88%, 13%) |
| OKLCH | oklch(25.3% 0.06 246.5) |
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 #04243D | 15.85:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #04243D | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #04243D text on white | 15.85:1 | AAA | Lc 102.6 | Preferred for body text |
| #04243D text on black | 1.32:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DCF2
oklch(88.4% 0.039 247.1)
-
Step 300
300
#9CC6EC
oklch(81% 0.07 246.1)
-
Step 400
400
#62A7E3
oklch(70.7% 0.113 246.5)
-
Step 500
500
#2C8FDB
oklch(63% 0.145 246.6)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#054470
oklch(37.6% 0.095 246.7)
-
Step 950
950 (this color)
#04243D
oklch(25.3% 0.06 246.5)
#04243D 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) | #18253E | 0.023 |
| Deuteranopia (no green cones) | #10203D | 0.016 |
| Tritanopia (no blue cones) | #002A2D | 0.042 |
| Achromatopsia (no color) | #222222 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04243D
#04243D
oklch(25.3% 0.06 246.5)
- #341C00
#341C00
oklch(25.3% 0.056 66.7)
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 #04243D, 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 0.033
- Rich Black #0D1B2A ΔE 0.043
- Jet #212529 ΔE 0.051
- Space Cadet #2B2D42 ΔE 0.063
- Navy Blue #001146 ΔE 0.064
- Marine #042E60 ΔE 0.068
- Gunmetal #293241 ΔE 0.070
Use #04243D 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.