#040F18
Closest named color: Rich Navy (#001219). oklch(16.2% 0.026 241.9), rgb(4, 15, 24).
Aa
White text reads best on this color (19.32:1).
About this color
#040F18 is a very dark close to neutral grey. In OKLCH its lightness is 16%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Rich Navy (#001219), ΔE 0.013 away. White text reads best on it, at 19.32:1.
| Hue family | Neutrals |
| Lightness | very dark (16%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.08:1 |
| White text | 19.32:1 |
Values
| HEX | #040F18 |
| RGB | rgb(4, 15, 24) |
| HSL | hsl(207, 71%, 5%) |
| OKLCH | oklch(16.2% 0.026 241.9) |
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 #040F18 | 19.32:1 | AAA | Lc -107.5 | Preferred for body text |
| Black text on #040F18 | 1.08:1 | Fails | Lc 0.0 | Not readable |
| #040F18 text on white | 19.32:1 | AAA | Lc 105.6 | Preferred for body text |
| #040F18 text on black | 1.08:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE4
oklch(88.6% 0.017 242.5)
-
Step 300
300
#B0C4D3
oklch(81% 0.03 240.3)
-
Step 400
400
#86A5BD
oklch(70.7% 0.049 241.7)
-
Step 500
500
#678FAD
oklch(63.2% 0.063 241.4)
-
Step 600
600
#4E7898
oklch(55.5% 0.068 242.3)
-
Step 700
700
#3E6582
oklch(49% 0.064 241.9)
-
Step 800
800
#34536A
oklch(42.8% 0.053 241.7)
-
Step 900
900
#2D4456
oklch(37.6% 0.042 242.8)
-
Step 950
950 (this color)
#040F18
oklch(16.2% 0.026 241.9)
#040F18 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) | #0B0F18 | 0.013 |
| Deuteranopia (no green cones) | #080D18 | 0.010 |
| Tritanopia (no blue cones) | #001112 | 0.020 |
| Achromatopsia (no color) | #0E0E0E | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040F18
#040F18
oklch(16.2% 0.026 241.9)
- #160B03
#160B03
oklch(16.3% 0.027 62.5)
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 #040F18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.013
- Almost Black #070D0D ΔE 0.023
- Rich Black #0D1B2A ΔE 0.057
- Dark Navy Blue #00022E ΔE 0.069
- Midnight #03012D ΔE 0.069
- Dark Navy #000435 ΔE 0.072
- Very Dark Blue #000133 ΔE 0.076
- Very Dark Brown #1D0200 ΔE 0.079
Use #040F18 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.