#040F31
Closest named color: Dark Navy (#000435). oklch(18.4% 0.07 264.8), rgb(4, 15, 49).
Aa
White text reads best on this color (18.78:1).
About this color
#040F31 is a very dark, moderately saturated blue. In OKLCH its lightness is 18%, its chroma 0.070 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Navy (#000435), ΔE 0.035 away. White text reads best on it, at 18.78:1.
| Hue family | Blues |
| Lightness | very dark (18%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Dark Navy (#000435) |
| Black text | 1.11:1 |
| White text | 18.78:1 |
Values
| HEX | #040F31 |
| RGB | rgb(4, 15, 49) |
| HSL | hsl(225, 85%, 10%) |
| OKLCH | oklch(18.4% 0.07 264.8) |
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 #040F31 | 18.78:1 | AAA | Lc -107.2 | Preferred for body text |
| Black text on #040F31 | 1.11:1 | Fails | Lc 0.0 | Not readable |
| #040F31 text on white | 18.78:1 | AAA | Lc 105.1 | Preferred for body text |
| #040F31 text on black | 1.11:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9F9
oklch(88.4% 0.047 265.5)
-
Step 300
300
#A6C0F7
oklch(80.8% 0.083 264.9)
-
Step 400
400
#779EF3
oklch(70.7% 0.132 264.6)
-
Step 500
500
#5583EF
oklch(63.1% 0.17 264.7)
-
Step 600
600
#3C6ADD
oklch(55.7% 0.183 264.7)
-
Step 700
700
#2E57C0
oklch(49% 0.171 264.7)
-
Step 800
800
#27489B
oklch(42.7% 0.141 264.7)
-
Step 900
900
#243D7C
oklch(37.7% 0.111 265.2)
-
Step 950
950 (this color)
#040F31
oklch(18.4% 0.07 264.8)
#040F31 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) | #001432 | 0.016 |
| Deuteranopia (no green cones) | #001030 | 0.008 |
| Tritanopia (no blue cones) | #00181E | 0.055 |
| Achromatopsia (no color) | #121212 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040F31
#040F31
oklch(18.4% 0.07 264.8)
- #1A1100
#1A1100
oklch(18.4% 0.038 85.8)
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 #040F31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Navy #000435 ΔE 0.035
- Navy Blue #001146 ΔE 0.041
- Dark Navy Blue #00022E ΔE 0.046
- Very Dark Blue #000133 ΔE 0.046
- Midnight #03012D ΔE 0.047
- Rich Black #0D1B2A ΔE 0.049
- Night Blue #040348 ΔE 0.050
- Rich Navy #001219 ΔE 0.054
Use #040F31 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.