#040F17
Closest named color: Rich Navy (#001219). oklch(16.2% 0.025 238.7), rgb(4, 15, 23).
Aa
White text reads best on this color (19.33:1).
About this color
#040F17 is a very dark close to neutral grey. In OKLCH its lightness is 16%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Rich Navy (#001219), ΔE 0.013 away. White text reads best on it, at 19.33:1.
| Hue family | Neutrals |
| Lightness | very dark (16%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.08:1 |
| White text | 19.33:1 |
Values
| HEX | #040F17 |
| RGB | rgb(4, 15, 23) |
| HSL | hsl(205, 70%, 5%) |
| OKLCH | oklch(16.2% 0.025 238.7) |
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 #040F17 | 19.33:1 | AAA | Lc -107.5 | Preferred for body text |
| Black text on #040F17 | 1.08:1 | Fails | Lc 0.0 | Not readable |
| #040F17 text on white | 19.33:1 | AAA | Lc 105.6 | Preferred for body text |
| #040F17 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE3
oklch(88.5% 0.016 239.1)
-
Step 300
300
#B0C4D2
oklch(81% 0.029 238.3)
-
Step 400
400
#86A5BB
oklch(70.6% 0.047 239.2)
-
Step 500
500
#678FAA
oklch(63.1% 0.06 238.5)
-
Step 600
600
#4E7995
oklch(55.6% 0.065 238.1)
-
Step 700
700
#3F667F
oklch(49.2% 0.06 237.8)
-
Step 800
800
#345368
oklch(42.7% 0.051 239.2)
-
Step 900
900
#2E4554
oklch(37.8% 0.038 237.7)
-
Step 950
950 (this color)
#040F17
oklch(16.2% 0.025 238.7)
#040F17 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) | #0B0F17 | 0.013 |
| Deuteranopia (no green cones) | #090D17 | 0.012 |
| Tritanopia (no blue cones) | #001112 | 0.018 |
| Achromatopsia (no color) | #0E0E0E | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040F17
#040F17
oklch(16.2% 0.025 238.7)
- #150B04
#150B04
oklch(16.1% 0.024 60.7)
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 #040F17, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.013
- Almost Black #070D0D ΔE 0.021
- Rich Black #0D1B2A ΔE 0.058
- Dark Navy Blue #00022E ΔE 0.071
- Midnight #03012D ΔE 0.071
- Dark Navy #000435 ΔE 0.074
- Very Dark Brown #1D0200 ΔE 0.078
- Very Dark Blue #000133 ΔE 0.078
Use #040F17 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.