#040B18
Closest named color: Rich Navy (#001219). oklch(14.9% 0.031 258.4), rgb(4, 11, 24).
Aa
White text reads best on this color (19.69:1).
About this color
#040B18 is a very dark, muted blue. In OKLCH its lightness is 15%, its chroma 0.031 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.027 away. White text reads best on it, at 19.69:1.
| Hue family | Blues |
| Lightness | very dark (15%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.06:1 |
| White text | 19.69:1 |
Values
| HEX | #040B18 |
| RGB | rgb(4, 11, 24) |
| HSL | hsl(219, 71%, 5%) |
| OKLCH | oklch(14.9% 0.031 258.4) |
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 #040B18 | 19.69:1 | AAA | Lc -107.7 | Preferred for body text |
| Black text on #040B18 | 1.06:1 | Fails | Lc 0.0 | Not readable |
| #040B18 text on white | 19.69:1 | AAA | Lc 105.7 | Preferred for body text |
| #040B18 text on black | 1.06:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D1DAE7
oklch(88.5% 0.02 257.5)
-
Step 300
300
#B2C2D9
oklch(80.9% 0.037 257.4)
-
Step 400
400
#8AA2C6
oklch(70.7% 0.059 258.4)
-
Step 500
500
#6D8BB7
oklch(63.1% 0.075 257.8)
-
Step 600
600
#5574A3
oklch(55.5% 0.082 258.5)
-
Step 700
700
#45618C
oklch(49% 0.077 258.7)
-
Step 800
800
#395072
oklch(42.8% 0.064 258)
-
Step 900
900
#31425C
oklch(37.6% 0.05 258.7)
-
Step 950
950 (this color)
#040B18
oklch(14.9% 0.031 258.4)
#040B18 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) | #060C19 | 0.007 |
| Deuteranopia (no green cones) | #040A18 | 0.004 |
| Tritanopia (no blue cones) | #000E10 | 0.026 |
| Achromatopsia (no color) | #0B0B0B | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040B18
#040B18
oklch(14.9% 0.031 258.4)
- #120900
#120900
oklch(14.9% 0.031 78)
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 #040B18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.027
- Almost Black #070D0D ΔE 0.028
- Midnight #03012D ΔE 0.058
- Dark Navy Blue #00022E ΔE 0.059
- Dark Navy #000435 ΔE 0.065
- Very Dark Blue #000133 ΔE 0.068
- Rich Black #0D1B2A ΔE 0.069
- Very Dark Brown #1D0200 ΔE 0.079
Use #040B18 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.