#040A1B
Closest named color: Rich Navy (#001219). oklch(14.9% 0.039 264.1), rgb(4, 10, 27).
Aa
White text reads best on this color (19.72:1).
About this color
#040A1B is a very dark, muted blue. In OKLCH its lightness is 15%, its chroma 0.039 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.033 away. White text reads best on it, at 19.72:1.
| Hue family | Blues |
| Lightness | very dark (15%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.06:1 |
| White text | 19.72:1 |
Values
| HEX | #040A1B |
| RGB | rgb(4, 10, 27) |
| HSL | hsl(224, 74%, 6%) |
| OKLCH | oklch(14.9% 0.039 264.1) |
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 #040A1B | 19.72:1 | AAA | Lc -107.7 | Preferred for body text |
| Black text on #040A1B | 1.06:1 | Fails | Lc 0.0 | Not readable |
| #040A1B text on white | 19.72:1 | AAA | Lc 105.7 | Preferred for body text |
| #040A1B 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B2C1DF
oklch(80.9% 0.046 264.3)
-
Step 400
400
#8AA1CF
oklch(70.8% 0.073 263.9)
-
Step 500
500
#6D89C2
oklch(63.2% 0.092 263.9)
-
Step 600
600
#5572AF
oklch(55.7% 0.101 264.1)
-
Step 700
700
#455F96
oklch(49.1% 0.094 264.1)
-
Step 800
800
#394E7A
oklch(42.8% 0.078 264)
-
Step 900
900
#314162
oklch(37.7% 0.061 264)
-
Step 950
950 (this color)
#040A1B
oklch(14.9% 0.039 264.1)
#040A1B 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) | #040C1C | 0.007 |
| Deuteranopia (no green cones) | #020A1B | 0.005 |
| Tritanopia (no blue cones) | #000E11 | 0.032 |
| Achromatopsia (no color) | #0B0B0B | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040A1B
#040A1B
oklch(14.9% 0.039 264.1)
- #110A00
#110A00
oklch(15% 0.031 85.7)
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 #040A1B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.033
- Almost Black #070D0D ΔE 0.036
- Midnight #03012D ΔE 0.050
- Dark Navy Blue #00022E ΔE 0.052
- Dark Navy #000435 ΔE 0.058
- Very Dark Blue #000133 ΔE 0.060
- Rich Black #0D1B2A ΔE 0.069
- Very Dark Brown #1D0200 ΔE 0.084
Use #040A1B 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.