#0A1239
Closest named color: Navy Blue (#001146). oklch(20.4% 0.076 269.6), rgb(10, 18, 57).
Aa
White text reads best on this color (18.12:1).
About this color
#0A1239 is a very dark, moderately saturated blue. In OKLCH its lightness is 20%, its chroma 0.076 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.029 away. White text reads best on it, at 18.12:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.15:1 |
| White text | 18.12:1 |
Values
| HEX | #0A1239 |
| RGB | rgb(10, 18, 57) |
| HSL | hsl(230, 70%, 13%) |
| OKLCH | oklch(20.4% 0.076 269.6) |
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 #0A1239 | 18.12:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #0A1239 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #0A1239 text on white | 18.12:1 | AAA | Lc 104.6 | Preferred for body text |
| #0A1239 text on black | 1.15:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CCD8FB
oklch(88.4% 0.05 270.4)
-
Step 300
300
#A9BEFC
oklch(80.8% 0.091 269.8)
-
Step 400
400
#7D9AFA
oklch(70.6% 0.144 269.7)
-
Step 500
500
#5E7EF8
oklch(63.2% 0.185 269.4)
-
Step 600
600
#4763E6
oklch(55.5% 0.2 269.6)
-
Step 700
700
#3951C8
oklch(49% 0.186 269.5)
-
Step 800
800
#2F43A2
oklch(42.6% 0.155 269.6)
-
Step 900
900
#293A80
oklch(37.6% 0.12 269.6)
-
Step 950
950 (this color)
#0A1239
oklch(20.4% 0.076 269.6)
#0A1239 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) | #00183A | 0.020 |
| Deuteranopia (no green cones) | #001438 | 0.015 |
| Tritanopia (no blue cones) | #001C23 | 0.062 |
| Achromatopsia (no color) | #161616 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1239
#0A1239
oklch(20.4% 0.076 269.6)
- #1E1600
#1E1600
oklch(20.4% 0.042 91.4)
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 #0A1239, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.029
- Night Blue #040348 ΔE 0.046
- Rich Black #0D1B2A ΔE 0.046
- Dark Navy #000435 ΔE 0.049
- Very Dark Blue #000133 ΔE 0.061
- Midnight #03012D ΔE 0.063
- Dark Navy Blue #00022E ΔE 0.063
- Dark Indigo #1F0954 ΔE 0.063
Use #0A1239 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.