#040F2B
Closest named color: Dark Navy (#000435). oklch(17.8% 0.06 263.3), rgb(4, 15, 43).
Aa
White text reads best on this color (18.94:1).
About this color
#040F2B is a very dark, muted blue. In OKLCH its lightness is 18%, its chroma 0.060 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Navy (#000435), ΔE 0.040 away. White text reads best on it, at 18.94:1.
| Hue family | Blues |
| Lightness | very dark (18%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Dark Navy (#000435) |
| Black text | 1.10:1 |
| White text | 18.94:1 |
Values
| HEX | #040F2B |
| RGB | rgb(4, 15, 43) |
| HSL | hsl(223, 83%, 9%) |
| OKLCH | oklch(17.8% 0.06 263.3) |
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 #040F2B | 18.94:1 | AAA | Lc -107.3 | Preferred for body text |
| Black text on #040F2B | 1.10:1 | Fails | Lc 0.0 | Not readable |
| #040F2B text on white | 18.94:1 | AAA | Lc 105.2 | Preferred for body text |
| #040F2B text on black | 1.10:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#A9C1EF
oklch(80.9% 0.07 263.3)
-
Step 400
400
#7BA0E7
oklch(70.7% 0.112 262.8)
-
Step 500
500
#5A86E0
oklch(63.1% 0.144 263.2)
-
Step 600
600
#416ECE
oklch(55.7% 0.157 263.3)
-
Step 700
700
#335BB2
oklch(49% 0.146 263.4)
-
Step 800
800
#2A4B90
oklch(42.7% 0.121 263.1)
-
Step 900
900
#263F73
oklch(37.6% 0.094 263.2)
-
Step 950
950 (this color)
#040F2B
oklch(17.8% 0.06 263.3)
#040F2B 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) | #01132C | 0.013 |
| Deuteranopia (no green cones) | #000F2A | 0.008 |
| Tritanopia (no blue cones) | #00161B | 0.047 |
| Achromatopsia (no color) | #111111 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040F2B
#040F2B
oklch(17.8% 0.06 263.3)
- #190F00
#190F00
oklch(17.7% 0.037 81.6)
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 #040F2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Navy #000435 ΔE 0.040
- Rich Navy #001219 ΔE 0.042
- Dark Navy Blue #00022E ΔE 0.046
- Midnight #03012D ΔE 0.047
- Rich Black #0D1B2A ΔE 0.047
- Very Dark Blue #000133 ΔE 0.049
- Navy Blue #001146 ΔE 0.053
- Night Blue #040348 ΔE 0.062
Use #040F2B 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.