#0B243D
Closest named color: Oxford Blue (#1B263B). oklch(25.5% 0.057 251), rgb(11, 36, 61).
Aa
White text reads best on this color (15.74:1).
About this color
#0B243D is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.057 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.022 away. White text reads best on it, at 15.74:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.33:1 |
| White text | 15.74:1 |
Values
| HEX | #0B243D |
| RGB | rgb(11, 36, 61) |
| HSL | hsl(210, 69%, 14%) |
| OKLCH | oklch(25.5% 0.057 251) |
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 #0B243D | 15.74:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #0B243D | 1.33:1 | Fails | Lc 0.0 | Not readable |
| #0B243D text on white | 15.74:1 | AAA | Lc 102.5 | Preferred for body text |
| #0B243D text on black | 1.33:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A1C4EB
oklch(80.8% 0.067 251.4)
-
Step 400
400
#6CA5E1
oklch(70.7% 0.107 250.7)
-
Step 500
500
#428DD9
oklch(63.1% 0.137 251.1)
-
Step 600
600
#1B75C6
oklch(55.5% 0.149 251.1)
-
Step 700
700
#0A62AB
oklch(49% 0.138 251)
-
Step 800
800
#0F508B
oklch(42.6% 0.115 251.4)
-
Step 900
900
#16436F
oklch(37.6% 0.09 251.1)
-
Step 950
950 (this color)
#0B243D
oklch(25.5% 0.057 251)
#0B243D 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) | #19253E | 0.018 |
| Deuteranopia (no green cones) | #11213D | 0.011 |
| Tritanopia (no blue cones) | #002A2D | 0.043 |
| Achromatopsia (no color) | #232323 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B243D
#0B243D
oklch(25.5% 0.057 251)
- #331E00
#331E00
oklch(25.6% 0.055 72.3)
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 #0B243D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.022
- Dark #1B2431 ΔE 0.029
- Rich Black #0D1B2A ΔE 0.043
- Jet #212529 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.058
- Navy Blue #001146 ΔE 0.066
- Gunmetal #293241 ΔE 0.066
- Marine #042E60 ΔE 0.067
Use #0B243D 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.