#0B283D
Closest named color: Oxford Blue (#1B263B). oklch(26.7% 0.052 243.7), rgb(11, 40, 61).
Aa
White text reads best on this color (15.16:1).
About this color
#0B283D is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.052 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.019 away. White text reads best on it, at 15.16:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.38:1 |
| White text | 15.16:1 |
Values
| HEX | #0B283D |
| RGB | rgb(11, 40, 61) |
| HSL | hsl(205, 69%, 14%) |
| OKLCH | oklch(26.7% 0.052 243.7) |
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 #0B283D | 15.16:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #0B283D | 1.38:1 | Fails | Lc 0.0 | Not readable |
| #0B283D text on white | 15.16:1 | AAA | Lc 101.9 | Preferred for body text |
| #0B283D text on black | 1.38:1 | 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
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#9FC6E6
oklch(80.9% 0.062 243.3)
-
Step 400
400
#68A7DA
oklch(70.6% 0.099 244.3)
-
Step 500
500
#3891D0
oklch(63.2% 0.126 243.4)
-
Step 600
600
#0079BC
oklch(55.5% 0.136 243.9)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#10456A
oklch(37.6% 0.083 244.4)
-
Step 950
950 (this color)
#0B283D
oklch(26.7% 0.052 243.7)
#0B283D 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) | #1E293E | 0.024 |
| Deuteranopia (no green cones) | #18243D | 0.018 |
| Tritanopia (no blue cones) | #002D2F | 0.037 |
| Achromatopsia (no color) | #262626 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B283D
#0B283D
oklch(26.7% 0.052 243.7)
- #371F06
#371F06
oklch(26.6% 0.052 63.2)
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 #0B283D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.019
- Dark #1B2431 ΔE 0.027
- Jet #212529 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.049
- Rich Black #0D1B2A ΔE 0.052
- Gunmetal #293241 ΔE 0.055
- Marine #042E60 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.064
Use #0B283D 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.