#0A3969
Closest named color: Marine Blue (#01386A). oklch(34.3% 0.097 253.3), rgb(10, 57, 105).
Aa
White text reads best on this color (11.65:1).
About this color
#0A3969 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.097 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.006 away. White text reads best on it, at 11.65:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.65:1 |
Values
| HEX | #0A3969 |
| RGB | rgb(10, 57, 105) |
| HSL | hsl(210, 83%, 23%) |
| OKLCH | oklch(34.3% 0.097 253.3) |
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 #0A3969 | 11.65:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #0A3969 | 1.80:1 | Fails | Lc 7.5 | Not readable |
| #0A3969 text on white | 11.65:1 | AAA | Lc 96.4 | Preferred for body text |
| #0A3969 text on black | 1.80:1 | 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 900.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A0C4EF
oklch(80.9% 0.072 253.1)
-
Step 400
400
#6BA4E7
oklch(70.7% 0.116 253.3)
-
Step 500
500
#408BE0
oklch(63% 0.148 253.6)
-
Step 600
600
#1873CE
oklch(55.5% 0.162 253.5)
-
Step 700
700
#0660B2
oklch(49% 0.15 253.4)
-
Step 800
800
#0D4F90
oklch(42.7% 0.124 253.3)
-
Step 900
900 (this color)
#0A3969
oklch(34.3% 0.097 253.3)
-
Step 950
950
#0E2743
oklch(26.9% 0.061 253.2)
#0A3969 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) | #203D6B | 0.024 |
| Deuteranopia (no green cones) | #0D3568 | 0.012 |
| Tritanopia (no blue cones) | #00454B | 0.074 |
| Achromatopsia (no color) | #383838 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3969
#0A3969
oklch(34.3% 0.097 253.3)
- #4F3200
#4F3200
oklch(34.4% 0.073 73.9)
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 #0A3969, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.006
- Prussian Blue #1D3557 ΔE 0.033
- Marine #042E60 ΔE 0.037
- Twilight Blue #0A437A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.053
- Midnight Green #073B4C ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.062
- Charcoal #264653 ΔE 0.069
Use #0A3969 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.