#040B19
Closest named color: Rich Navy (#001219). oklch(15% 0.033 259.6), rgb(4, 11, 25).
Aa
White text reads best on this color (19.68:1).
About this color
#040B19 is a very dark, muted blue. In OKLCH its lightness is 15%, its chroma 0.033 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.028 away. White text reads best on it, at 19.68:1.
| Hue family | Blues |
| Lightness | very dark (15%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.06:1 |
| White text | 19.68:1 |
Values
| HEX | #040B19 |
| RGB | rgb(4, 11, 25) |
| HSL | hsl(220, 72%, 6%) |
| OKLCH | oklch(15% 0.033 259.6) |
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 #040B19 | 19.68:1 | AAA | Lc -107.7 | Preferred for body text |
| Black text on #040B19 | 1.06:1 | Fails | Lc 0.0 | Not readable |
| #040B19 text on white | 19.68:1 | AAA | Lc 105.7 | Preferred for body text |
| #040B19 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
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D1DAE8
oklch(88.6% 0.022 259.2)
-
Step 300
300
#B2C2DB
oklch(81% 0.04 259.3)
-
Step 400
400
#8AA2C8
oklch(70.7% 0.062 259.5)
-
Step 500
500
#6D8ABA
oklch(63% 0.08 260.3)
-
Step 600
600
#5474A6
oklch(55.6% 0.087 259.1)
-
Step 700
700
#45618F
oklch(49.1% 0.081 260)
-
Step 800
800
#394F74
oklch(42.7% 0.068 260.4)
-
Step 900
900
#31425D
oklch(37.7% 0.052 259.4)
-
Step 950
950 (this color)
#040B19
oklch(15% 0.033 259.6)
#040B19 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) | #060C1A | 0.007 |
| Deuteranopia (no green cones) | #040A19 | 0.004 |
| Tritanopia (no blue cones) | #000E10 | 0.028 |
| Achromatopsia (no color) | #0B0B0B | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040B19
#040B19
oklch(15% 0.033 259.6)
- #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 #040B19, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.028
- Almost Black #070D0D ΔE 0.030
- Midnight #03012D ΔE 0.056
- Dark Navy Blue #00022E ΔE 0.057
- Dark Navy #000435 ΔE 0.063
- Very Dark Blue #000133 ΔE 0.066
- Rich Black #0D1B2A ΔE 0.068
- Very Dark Brown #1D0200 ΔE 0.081
Use #040B19 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.