#0B1B39
Closest named color: Rich Black (#0D1B2A). oklch(22.8% 0.062 261.7), rgb(11, 27, 57).
Aa
White text reads best on this color (17.07:1).
About this color
#0B1B39 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.062 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.030 away. White text reads best on it, at 17.07:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.07:1 |
Values
| HEX | #0B1B39 |
| RGB | rgb(11, 27, 57) |
| HSL | hsl(219, 68%, 13%) |
| OKLCH | oklch(22.8% 0.062 261.7) |
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 #0B1B39 | 17.07:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #0B1B39 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #0B1B39 text on white | 17.07:1 | AAA | Lc 103.8 | Preferred for body text |
| #0B1B39 text on black | 1.23:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A7C1F1
oklch(80.8% 0.074 262.5)
-
Step 400
400
#77A0EA
oklch(70.7% 0.118 261.7)
-
Step 500
500
#5487E3
oklch(63.1% 0.149 261.3)
-
Step 600
600
#3A6ED1
oklch(55.6% 0.163 261.8)
-
Step 700
700
#2C5BB5
oklch(49% 0.152 261.8)
-
Step 800
800
#254B93
oklch(42.7% 0.127 261.7)
-
Step 900
900
#233F75
oklch(37.6% 0.099 262.1)
-
Step 950
950 (this color)
#0B1B39
oklch(22.8% 0.062 261.7)
#0B1B39 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) | #0C1E3A | 0.010 |
| Deuteranopia (no green cones) | #041A38 | 0.010 |
| Tritanopia (no blue cones) | #002227 | 0.050 |
| Achromatopsia (no color) | #1C1C1C | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B1B39
#0B1B39
oklch(22.8% 0.062 261.7)
- #271A00
#271A00
oklch(22.8% 0.047 83.1)
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 #0B1B39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.030
- Navy Blue #001146 ΔE 0.044
- Dark #1B2431 ΔE 0.046
- Oxford Blue #1B263B ΔE 0.046
- Jet #212529 ΔE 0.063
- Night Blue #040348 ΔE 0.069
- Dark Indigo #1F0954 ΔE 0.071
- Rich Navy #001219 ΔE 0.072
Use #0B1B39 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.