#0A3565
Closest named color: Marine Blue (#01386A). oklch(33% 0.096 254.7), rgb(10, 53, 101).
Aa
White text reads best on this color (12.28:1).
About this color
#0A3565 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.096 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.012 away. White text reads best on it, at 12.28:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.28:1 |
Values
| HEX | #0A3565 |
| RGB | rgb(10, 53, 101) |
| HSL | hsl(212, 82%, 22%) |
| OKLCH | oklch(33% 0.096 254.7) |
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 #0A3565 | 12.28:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #0A3565 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #0A3565 text on white | 12.28:1 | AAA | Lc 97.6 | Preferred for body text |
| #0A3565 text on black | 1.71:1 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A1C3EF
oklch(80.8% 0.073 255)
-
Step 400
400
#6EA3E7
oklch(70.6% 0.115 255.1)
-
Step 500
500
#448BE0
oklch(63.2% 0.147 254.5)
-
Step 600
600
#2273CE
oklch(55.7% 0.16 254.7)
-
Step 700
700
#1360B2
oklch(49.2% 0.148 254.6)
-
Step 800
800
#144E90
oklch(42.6% 0.123 255)
-
Step 900
900 (this color)
#0A3565
oklch(33% 0.096 254.7)
-
Step 950
950
#102743
oklch(27% 0.06 254.6)
#0A3565 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) | #1B3967 | 0.020 |
| Deuteranopia (no green cones) | #073164 | 0.013 |
| Tritanopia (no blue cones) | #004148 | 0.073 |
| Achromatopsia (no color) | #353535 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3565
#0A3565
oklch(33% 0.096 254.7)
- #4A2F00
#4A2F00
oklch(33% 0.07 74.6)
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 #0A3565, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.012
- Marine #042E60 ΔE 0.024
- Prussian Blue #1D3557 ΔE 0.028
- Twilight Blue #0A437A ΔE 0.052
- Midnight Green #073B4C ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.054
- Gunmetal #293241 ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.068
Use #0A3565 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.