#040A19
Closest named color: Rich Navy (#001219). oklch(14.7% 0.035 262.6), rgb(4, 10, 25).
Aa
White text reads best on this color (19.76:1).
About this color
#040A19 is a very dark, muted blue. In OKLCH its lightness is 15%, its chroma 0.035 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.032 away. White text reads best on it, at 19.76:1.
| Hue family | Blues |
| Lightness | very dark (15%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.06:1 |
| White text | 19.76:1 |
Values
| HEX | #040A19 |
| RGB | rgb(4, 10, 25) |
| HSL | hsl(223, 72%, 6%) |
| OKLCH | oklch(14.7% 0.035 262.6) |
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 #040A19 | 19.76:1 | AAA | Lc -107.7 | Preferred for body text |
| Black text on #040A19 | 1.06:1 | Fails | Lc 0.0 | Not readable |
| #040A19 text on white | 19.76:1 | AAA | Lc 105.8 | Preferred for body text |
| #040A19 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D1D9E9
oklch(88.4% 0.024 264.4)
-
Step 300
300
#B3C1DC
oklch(80.9% 0.041 263.6)
-
Step 400
400
#8BA1CA
oklch(70.7% 0.065 262.7)
-
Step 500
500
#6E89BD
oklch(63% 0.085 263)
-
Step 600
600
#5673A9
oklch(55.7% 0.091 262.2)
-
Step 700
700
#466091
oklch(49.1% 0.085 262.4)
-
Step 800
800
#3A4F76
oklch(42.8% 0.07 262.2)
-
Step 900
900
#32415F
oklch(37.6% 0.055 263.6)
-
Step 950
950 (this color)
#040A19
oklch(14.7% 0.035 262.6)
#040A19 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) | #050B1A | 0.005 |
| Deuteranopia (no green cones) | #030919 | 0.005 |
| Tritanopia (no blue cones) | #000D10 | 0.028 |
| Achromatopsia (no color) | #0A0A0A | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040A19
#040A19
oklch(14.7% 0.035 262.6)
- #110900
#110900
oklch(14.7% 0.03 81.2)
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 #040A19, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.032
- Almost Black #070D0D ΔE 0.032
- Midnight #03012D ΔE 0.054
- Dark Navy Blue #00022E ΔE 0.055
- Dark Navy #000435 ΔE 0.062
- Very Dark Blue #000133 ΔE 0.064
- Rich Black #0D1B2A ΔE 0.071
- Very Dark Brown #1D0200 ΔE 0.081
Use #040A19 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.