#0A3A78
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.117 257.4), rgb(10, 58, 120).
Aa
White text reads best on this color (11.11:1).
About this color
#0A3A78 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.117 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.026 away. White text reads best on it, at 11.11:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #0A3A78 |
| RGB | rgb(10, 58, 120) |
| HSL | hsl(214, 85%, 25%) |
| OKLCH | oklch(35.7% 0.117 257.4) |
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 #0A3A78 | 11.11:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #0A3A78 | 1.88:1 | Fails | Lc 8.7 | Not readable |
| #0A3A78 text on white | 11.11:1 | AAA | Lc 95.2 | Preferred for body text |
| #0A3A78 text on black | 1.88:1 | Fails | Lc -7.5 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9DC3F9
oklch(80.9% 0.087 257.2)
-
Step 400
400
#66A1F7
oklch(70.6% 0.141 257.8)
-
Step 500
500
#3887F3
oklch(63.1% 0.179 257.3)
-
Step 600
600
#0B6EE2
oklch(55.7% 0.195 257.3)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#054B9F
oklch(42.8% 0.15 257.4)
-
Step 900
900 (this color)
#0A3A78
oklch(35.7% 0.117 257.4)
-
Step 950
950
#0C264A
oklch(27.1% 0.074 257.4)
#0A3A78 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) | #13417A | 0.022 |
| Deuteranopia (no green cones) | #003777 | 0.011 |
| Tritanopia (no blue cones) | #004953 | 0.088 |
| Achromatopsia (no color) | #3C3C3C | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3A78
#0A3A78
oklch(35.7% 0.117 257.4)
- #523600
#523600
oklch(35.7% 0.075 76.7)
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 #0A3A78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.026
- Twilight Blue #0A437A ΔE 0.027
- Marine #042E60 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.058
- Cobalt #1E488F ΔE 0.058
- Light Navy #155084 ΔE 0.068
- Dark Grey Blue #29465B ΔE 0.074
- Dark Blue Grey #1F3B4D ΔE 0.077
Use #0A3A78 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.