#0B1F43
Closest named color: Oxford Blue (#1B263B). oklch(24.7% 0.073 261.1), rgb(11, 31, 67).
Aa
White text reads best on this color (16.26:1).
About this color
#0B1F43 is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.073 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.038 away. White text reads best on it, at 16.26:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.26:1 |
Values
| HEX | #0B1F43 |
| RGB | rgb(11, 31, 67) |
| HSL | hsl(219, 72%, 15%) |
| OKLCH | oklch(24.7% 0.073 261.1) |
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 #0B1F43 | 16.26:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #0B1F43 | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #0B1F43 text on white | 16.26:1 | AAA | Lc 103.0 | Preferred for body text |
| #0B1F43 text on black | 1.29:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A1C2F9
oklch(81% 0.086 260.5)
-
Step 400
400
#6EA0F6
oklch(70.8% 0.138 260.7)
-
Step 500
500
#4885F2
oklch(63.1% 0.176 261)
-
Step 600
600
#2A6BE1
oklch(55.5% 0.192 261.2)
-
Step 700
700
#1D59C4
oklch(49.2% 0.178 261)
-
Step 800
800
#1A499E
oklch(42.7% 0.148 261.1)
-
Step 900
900
#1B3E7E
oklch(37.7% 0.116 261.2)
-
Step 950
950 (this color)
#0B1F43
oklch(24.7% 0.073 261.1)
#0B1F43 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) | #0B2344 | 0.013 |
| Deuteranopia (no green cones) | #011E42 | 0.012 |
| Tritanopia (no blue cones) | #00282D | 0.059 |
| Achromatopsia (no color) | #202020 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B1F43
#0B1F43
oklch(24.7% 0.073 261.1)
- #2D1E00
#2D1E00
oklch(24.7% 0.051 81.9)
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 #0B1F43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.038
- Navy Blue #001146 ΔE 0.047
- Dark #1B2431 ΔE 0.047
- Rich Black #0D1B2A ΔE 0.048
- Dark Indigo #1F0954 ΔE 0.064
- Jet #212529 ΔE 0.066
- Marine #042E60 ΔE 0.066
- Space Cadet #2B2D42 ΔE 0.070
Use #0B1F43 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.