#0A315F
Closest named color: Marine (#042E60). oklch(31.5% 0.092 255.5), rgb(10, 49, 95).
Aa
White text reads best on this color (12.98:1).
About this color
#0A315F is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.092 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.011 away. White text reads best on it, at 12.98:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.61:1 |
| White text | 12.98:1 |
Values
| HEX | #0A315F |
| RGB | rgb(10, 49, 95) |
| HSL | hsl(212, 81%, 21%) |
| OKLCH | oklch(31.5% 0.092 255.5) |
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 #0A315F | 12.98:1 | AAA | Lc -102.2 | Preferred for body text |
| Black text on #0A315F | 1.61:1 | Fails | Lc 0.0 | Not readable |
| #0A315F text on white | 12.98:1 | AAA | Lc 98.8 | Preferred for body text |
| #0A315F text on black | 1.61:1 | 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
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DDEBFF
oklch(93.6% 0.031 257.2)
-
Step 200
200
#C1DCFF
oklch(88.6% 0.056 255)
-
Step 300
300
#96C4FF
oklch(81% 0.097 254.9)
-
Step 400
400
#59A2FF
oklch(70.7% 0.155 255.4)
-
Step 500
500
#1887FF
oklch(63.2% 0.201 255.4)
-
Step 600
600
#0070DD
oklch(55.6% 0.187 255.6)
-
Step 700
700
#005EBB
oklch(49.1% 0.165 255.5)
-
Step 800
800
#004D9B
oklch(42.8% 0.143 255.4)
-
Step 900
900
#004082
oklch(37.8% 0.125 255.2)
-
Step 950
950 (this color)
#0A315F
oklch(31.5% 0.092 255.5)
#0A315F 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) | #183561 | 0.019 |
| Deuteranopia (no green cones) | #052E5E | 0.011 |
| Tritanopia (no blue cones) | #003C43 | 0.069 |
| Achromatopsia (no color) | #313131 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A315F
#0A315F
oklch(31.5% 0.092 255.5)
- #452C00
#452C00
oklch(31.6% 0.067 75.3)
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 #0A315F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.011
- Marine Blue #01386A ΔE 0.026
- Prussian Blue #1D3557 ΔE 0.027
- Midnight Green #073B4C ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.061
- Gunmetal #293241 ΔE 0.063
- Midnight Blue #191970 ΔE 0.068
Use #0A315F 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.