#0C3173
Closest named color: Marine Blue (#01386A). oklch(33.3% 0.121 261), rgb(12, 49, 115).
Aa
White text reads best on this color (12.33:1).
About this color
#0C3173 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.121 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.027 away. White text reads best on it, at 12.33:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.70:1 |
| White text | 12.33:1 |
Values
| HEX | #0C3173 |
| RGB | rgb(12, 49, 115) |
| HSL | hsl(218, 81%, 25%) |
| OKLCH | oklch(33.3% 0.121 261) |
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 #0C3173 | 12.33:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #0C3173 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #0C3173 text on white | 12.33:1 | AAA | Lc 97.5 | Preferred for body text |
| #0C3173 text on black | 1.70:1 | 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
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A0C2FC
oklch(81% 0.09 260.9)
-
Step 400
400
#6B9FFB
oklch(70.7% 0.146 261.1)
-
Step 500
500
#4384F8
oklch(63.1% 0.186 260.9)
-
Step 600
600
#246AE7
oklch(55.6% 0.202 261)
-
Step 700
700
#1757C9
oklch(49.1% 0.189 261.1)
-
Step 800
800
#1648A2
oklch(42.7% 0.155 261.1)
-
Step 900
900 (this color)
#0C3173
oklch(33.3% 0.121 261)
-
Step 950
950
#0F254B
oklch(27% 0.076 260.5)
#0C3173 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) | #003975 | 0.022 |
| Deuteranopia (no green cones) | #003072 | 0.009 |
| Tritanopia (no blue cones) | #00414D | 0.091 |
| Achromatopsia (no color) | #353535 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0C3173
#0C3173
oklch(33.3% 0.121 261)
- #483200
#483200
oklch(33.4% 0.069 81.7)
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 #0C3173, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.027
- Marine #042E60 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.054
- Midnight Blue #191970 ΔE 0.057
- Royal #0C1793 ΔE 0.073
- Dark Blue Grey #1F3B4D ΔE 0.081
- Midnight Green #073B4C ΔE 0.081
Use #0C3173 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.