#040C23
Closest named color: Rich Navy (#001219). oklch(16.2% 0.05 264.4), rgb(4, 12, 35).
Aa
White text reads best on this color (19.40:1).
About this color
#040C23 is a very dark, muted blue. In OKLCH its lightness is 16%, its chroma 0.050 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.035 away. White text reads best on it, at 19.40:1.
| Hue family | Blues |
| Lightness | very dark (16%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.08:1 |
| White text | 19.40:1 |
Values
| HEX | #040C23 |
| RGB | rgb(4, 12, 35) |
| HSL | hsl(225, 79%, 8%) |
| OKLCH | oklch(16.2% 0.05 264.4) |
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 #040C23 | 19.40:1 | AAA | Lc -107.5 | Preferred for body text |
| Black text on #040C23 | 1.08:1 | Fails | Lc 0.0 | Not readable |
| #040C23 text on white | 19.40:1 | AAA | Lc 105.5 | Preferred for body text |
| #040C23 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F0
oklch(88.4% 0.034 265.2)
-
Step 300
300
#AEC1E8
oklch(81% 0.059 264.6)
-
Step 400
400
#83A0DD
oklch(70.8% 0.096 264.5)
-
Step 500
500
#6487D3
oklch(63.1% 0.122 264.4)
-
Step 600
600
#4B6FC0
oklch(55.5% 0.133 264.4)
-
Step 700
700
#3D5DA6
oklch(49.1% 0.123 264.5)
-
Step 800
800
#324C86
oklch(42.6% 0.102 264.3)
-
Step 900
900
#2C406C
oklch(37.7% 0.08 264.4)
-
Step 950
950 (this color)
#040C23
oklch(16.2% 0.05 264.4)
#040C23 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) | #020F24 | 0.011 |
| Deuteranopia (no green cones) | #000C23 | 0.009 |
| Tritanopia (no blue cones) | #001115 | 0.040 |
| Achromatopsia (no color) | #0D0D0D | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040C23
#040C23
oklch(16.2% 0.05 264.4)
- #140C00
#140C00
oklch(16.1% 0.033 84.4)
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 #040C23, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.035
- Midnight #03012D ΔE 0.043
- Dark Navy Blue #00022E ΔE 0.044
- Dark Navy #000435 ΔE 0.045
- Almost Black #070D0D ΔE 0.048
- Very Dark Blue #000133 ΔE 0.050
- Rich Black #0D1B2A ΔE 0.058
- Navy Blue #001146 ΔE 0.071
Use #040C23 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.