#011B33
Closest named color: Rich Black (#0D1B2A). oklch(21.7% 0.057 248.8), rgb(1, 27, 51).
Aa
White text reads best on this color (17.41:1).
About this color
#011B33 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.057 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 17.41:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.41:1 |
Values
| HEX | #011B33 |
| RGB | rgb(1, 27, 51) |
| HSL | hsl(209, 96%, 10%) |
| OKLCH | oklch(21.7% 0.057 248.8) |
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 #011B33 | 17.41:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #011B33 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #011B33 text on white | 17.41:1 | AAA | Lc 104.0 | Preferred for body text |
| #011B33 text on black | 1.20:1 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#9FC5EB
oklch(80.9% 0.068 248.7)
-
Step 400
400
#68A6E1
oklch(70.7% 0.108 248.4)
-
Step 500
500
#3A8ED9
oklch(63.1% 0.139 248.9)
-
Step 600
600
#0477C7
oklch(55.7% 0.151 248.7)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#01518B
oklch(42.6% 0.117 248.9)
-
Step 900
900
#11446F
oklch(37.7% 0.09 248.7)
-
Step 950
950 (this color)
#011B33
oklch(21.7% 0.057 248.8)
#011B33 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) | #0F1C34 | 0.018 |
| Deuteranopia (no green cones) | #071833 | 0.012 |
| Tritanopia (no blue cones) | #002124 | 0.042 |
| Achromatopsia (no color) | #1A1A1A | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #011B33
#011B33
oklch(21.7% 0.057 248.8)
- #281500
#281500
oklch(21.7% 0.048 68.3)
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 #011B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Navy Blue #001146 ΔE 0.049
- Dark #1B2431 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.055
- Rich Navy #001219 ΔE 0.058
- Jet #212529 ΔE 0.066
- Dark Navy #000435 ΔE 0.072
- Night Blue #040348 ΔE 0.073
Use #011B33 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.