#0A3377
Closest named color: Marine Blue (#01386A). oklch(34% 0.125 260.4), rgb(10, 51, 119).
Aa
White text reads best on this color (11.98:1).
About this color
#0A3377 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.125 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.028 away. White text reads best on it, at 11.98:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.75:1 |
| White text | 11.98:1 |
Values
| HEX | #0A3377 |
| RGB | rgb(10, 51, 119) |
| HSL | hsl(217, 84%, 25%) |
| OKLCH | oklch(34% 0.125 260.4) |
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 #0A3377 | 11.98:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #0A3377 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #0A3377 text on white | 11.98:1 | AAA | Lc 96.8 | Preferred for body text |
| #0A3377 text on black | 1.75:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9EC2FE
oklch(81% 0.094 260.4)
-
Step 400
400
#689FFD
oklch(70.6% 0.15 260.5)
-
Step 500
500
#3E84FB
oklch(63.2% 0.191 260.3)
-
Step 600
600
#1B6AEA
oklch(55.7% 0.208 260.3)
-
Step 700
700
#0D57CC
oklch(49.2% 0.194 260.4)
-
Step 800
800
#0F48A5
oklch(42.8% 0.161 260.4)
-
Step 900
900 (this color)
#0A3377
oklch(34% 0.125 260.4)
-
Step 950
950
#0D254C
oklch(27% 0.078 259.7)
#0A3377 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) | #003C79 | 0.025 |
| Deuteranopia (no green cones) | #003276 | 0.007 |
| Tritanopia (no blue cones) | #00444F | 0.096 |
| Achromatopsia (no color) | #373737 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3377
#0A3377
oklch(34% 0.125 260.4)
- #4B3300
#4B3300
oklch(34% 0.071 79.7)
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 #0A3377, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.028
- Marine #042E60 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.059
- Midnight Blue #191970 ΔE 0.062
- Royal #0C1793 ΔE 0.072
- Cobalt #1E488F ΔE 0.074
- Dark Blue Grey #1F3B4D ΔE 0.084
Use #0A3377 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.