#0A1B40
Closest named color: Navy Blue (#001146). oklch(23.3% 0.074 263.3), rgb(10, 27, 64).
Aa
White text reads best on this color (16.88:1).
About this color
#0A1B40 is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.074 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.036 away. White text reads best on it, at 16.88:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.24:1 |
| White text | 16.88:1 |
Values
| HEX | #0A1B40 |
| RGB | rgb(10, 27, 64) |
| HSL | hsl(221, 73%, 15%) |
| OKLCH | oklch(23.3% 0.074 263.3) |
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 #0A1B40 | 16.88:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #0A1B40 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #0A1B40 text on white | 16.88:1 | AAA | Lc 103.6 | Preferred for body text |
| #0A1B40 text on black | 1.24:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A3C1FA
oklch(80.9% 0.087 263)
-
Step 400
400
#729EF8
oklch(70.7% 0.141 263.5)
-
Step 500
500
#4D83F5
oklch(63.1% 0.18 263.2)
-
Step 600
600
#3269E3
oklch(55.5% 0.195 263.2)
-
Step 700
700
#2557C6
oklch(49.2% 0.182 263.1)
-
Step 800
800
#2048A0
oklch(42.8% 0.15 263.1)
-
Step 900
900
#1F3D7F
oklch(37.7% 0.118 263.4)
-
Step 950
950 (this color)
#0A1B40
oklch(23.3% 0.074 263.3)
#0A1B40 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) | #051F41 | 0.013 |
| Deuteranopia (no green cones) | #001B3F | 0.012 |
| Tritanopia (no blue cones) | #00242A | 0.059 |
| Achromatopsia (no color) | #1D1D1D | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1B40
#0A1B40
oklch(23.3% 0.074 263.3)
- #281B00
#281B00
oklch(23.2% 0.048 83.7)
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 #0A1B40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.036
- Rich Black #0D1B2A ΔE 0.043
- Oxford Blue #1B263B ΔE 0.048
- Dark #1B2431 ΔE 0.053
- Dark Indigo #1F0954 ΔE 0.061
- Night Blue #040348 ΔE 0.063
- Jet #212529 ΔE 0.071
- Dark Navy #000435 ΔE 0.076
Use #0A1B40 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.