#0F3571
Closest named color: Marine Blue (#01386A). oklch(34.1% 0.112 259.6), rgb(15, 53, 113).
Aa
White text reads best on this color (11.87:1).
About this color
#0F3571 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.112 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.017 away. White text reads best on it, at 11.87:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.87:1 |
Values
| HEX | #0F3571 |
| RGB | rgb(15, 53, 113) |
| HSL | hsl(217, 77%, 25%) |
| OKLCH | oklch(34.1% 0.112 259.6) |
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 #0F3571 | 11.87:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #0F3571 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #0F3571 text on white | 11.87:1 | AAA | Lc 96.8 | Preferred for body text |
| #0F3571 text on black | 1.76:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F7
oklch(80.9% 0.084 259.8)
-
Step 400
400
#6DA0F4
oklch(70.6% 0.135 260)
-
Step 500
500
#4586F0
oklch(63.1% 0.173 259.7)
-
Step 600
600
#256DDE
oklch(55.6% 0.187 259.6)
-
Step 700
700
#175AC1
oklch(49.1% 0.174 259.6)
-
Step 800
800
#164A9C
oklch(42.6% 0.145 259.6)
-
Step 900
900 (this color)
#0F3571
oklch(34.1% 0.112 259.6)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#0F3571 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) | #0E3C73 | 0.021 |
| Deuteranopia (no green cones) | #003370 | 0.012 |
| Tritanopia (no blue cones) | #00444D | 0.088 |
| Achromatopsia (no color) | #373737 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0F3571
#0F3571
oklch(34.1% 0.112 259.6)
- #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 #0F3571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.017
- Marine #042E60 ΔE 0.037
- Twilight Blue #0A437A ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.047
- Midnight Blue #191970 ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.071
- Midnight Green #073B4C ΔE 0.072
- Cobalt #1E488F ΔE 0.074
Use #0F3571 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.