#040D21
Closest named color: Rich Navy (#001219). oklch(16.3% 0.045 261.7), rgb(4, 13, 33).
Aa
White text reads best on this color (19.36:1).
About this color
#040D21 is a very dark, muted blue. In OKLCH its lightness is 16%, its chroma 0.045 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.029 away. White text reads best on it, at 19.36:1.
| Hue family | Blues |
| Lightness | very dark (16%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.08:1 |
| White text | 19.36:1 |
Values
| HEX | #040D21 |
| RGB | rgb(4, 13, 33) |
| HSL | hsl(221, 78%, 7%) |
| OKLCH | oklch(16.3% 0.045 261.7) |
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 #040D21 | 19.36:1 | AAA | Lc -107.5 | Preferred for body text |
| Black text on #040D21 | 1.08:1 | Fails | Lc 0.0 | Not readable |
| #040D21 text on white | 19.36:1 | AAA | Lc 105.5 | Preferred for body text |
| #040D21 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CFDAED
oklch(88.6% 0.029 261.5)
-
Step 300
300
#AEC1E4
oklch(80.8% 0.054 262.6)
-
Step 400
400
#83A1D6
oklch(70.7% 0.085 261.5)
-
Step 500
500
#6489CB
oklch(63.1% 0.108 261.4)
-
Step 600
600
#4B72B8
oklch(55.6% 0.118 261.3)
-
Step 700
700
#3D5F9F
oklch(49.1% 0.11 262)
-
Step 800
800
#324E81
oklch(42.8% 0.092 261.5)
-
Step 900
900
#2C4167
oklch(37.7% 0.071 261.6)
-
Step 950
950 (this color)
#040D21
oklch(16.3% 0.045 261.7)
#040D21 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) | #040F22 | 0.007 |
| Deuteranopia (no green cones) | #010C21 | 0.008 |
| Tritanopia (no blue cones) | #001215 | 0.037 |
| Achromatopsia (no color) | #0E0E0E | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040D21
#040D21
oklch(16.3% 0.045 261.7)
- #150C00
#150C00
oklch(16.3% 0.034 81.5)
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 #040D21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.029
- Almost Black #070D0D ΔE 0.043
- Midnight #03012D ΔE 0.049
- Dark Navy Blue #00022E ΔE 0.049
- Dark Navy #000435 ΔE 0.051
- Very Dark Blue #000133 ΔE 0.056
- Rich Black #0D1B2A ΔE 0.056
- Navy Blue #001146 ΔE 0.074
Use #040D21 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.