#040A10
Closest named color: Almost Black (#070D0D). oklch(14% 0.018 243.2), rgb(4, 10, 16).
Aa
White text reads best on this color (19.88:1).
About this color
#040A10 is a very dark close to neutral grey. In OKLCH its lightness is 14%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Almost Black (#070D0D), ΔE 0.018 away. White text reads best on it, at 19.88:1.
| Hue family | Neutrals |
| Lightness | very dark (14%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Almost Black (#070D0D) |
| Black text | 1.05:1 |
| White text | 19.88:1 |
Values
| HEX | #040A10 |
| RGB | rgb(4, 10, 16) |
| HSL | hsl(210, 60%, 4%) |
| OKLCH | oklch(14% 0.018 243.2) |
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 #040A10 | 19.88:1 | AAA | Lc -107.7 | Preferred for body text |
| Black text on #040A10 | 1.05:1 | Fails | Lc 0.0 | Not readable |
| #040A10 text on white | 19.88:1 | AAA | Lc 105.9 | Preferred for body text |
| #040A10 text on black | 1.05:1 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D3DAE0
oklch(88.5% 0.011 243.7)
-
Step 300
300
#B5C3CD
oklch(80.9% 0.021 238.7)
-
Step 400
400
#8FA4B4
oklch(70.8% 0.033 240.9)
-
Step 500
500
#738DA2
oklch(63.1% 0.043 242.8)
-
Step 600
600
#5C778D
oklch(55.6% 0.047 243.3)
-
Step 700
700
#4B6478
oklch(49.1% 0.044 242.9)
-
Step 800
800
#3E5262
oklch(42.8% 0.036 242.8)
-
Step 900
900
#354450
oklch(37.8% 0.028 242.6)
-
Step 950
950 (this color)
#040A10
oklch(14% 0.018 243.2)
#040A10 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) | #080A10 | 0.010 |
| Deuteranopia (no green cones) | #060910 | 0.006 |
| Tritanopia (no blue cones) | #010B0C | 0.014 |
| Achromatopsia (no color) | #090909 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040A10
#040A10
oklch(14% 0.018 243.2)
- #0E0803
#0E0803
oklch(14.1% 0.018 70.5)
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 #040A10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Almost Black #070D0D ΔE 0.018
- Rich Navy #001219 ΔE 0.033
- Very Dark Brown #1D0200 ΔE 0.071
- Midnight #03012D ΔE 0.073
- Dark Navy Blue #00022E ΔE 0.073
- Rich Black #0D1B2A ΔE 0.079
- Dark Navy #000435 ΔE 0.081
- Very Dark Blue #000133 ΔE 0.082
Use #040A10 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.