#003671
Closest named color: Marine Blue (#01386A). oklch(34% 0.114 255.6), rgb(0, 54, 113).
Aa
White text reads best on this color (11.89:1).
About this color
#003671 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.114 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.014 away. White text reads best on it, at 11.89:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.89:1 |
Values
| HEX | #003671 |
| RGB | rgb(0, 54, 113) |
| HSL | hsl(211, 100%, 22%) |
| OKLCH | oklch(34% 0.114 255.6) |
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 #003671 | 11.89:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #003671 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #003671 text on white | 11.89:1 | AAA | Lc 96.6 | Preferred for body text |
| #003671 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9CC3F8
oklch(80.8% 0.086 256.2)
-
Step 400
400
#64A2F4
oklch(70.6% 0.137 255.9)
-
Step 500
500
#3489F0
oklch(63.2% 0.174 255.5)
-
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
#004C9B
oklch(42.6% 0.144 255.8)
-
Step 900
900 (this color)
#003671
oklch(34% 0.114 255.6)
-
Step 950
950
#0A2649
oklch(26.9% 0.073 255.8)
#003671 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) | #103C73 | 0.022 |
| Deuteranopia (no green cones) | #003370 | 0.009 |
| Tritanopia (no blue cones) | #00454E | 0.086 |
| Achromatopsia (no color) | #373737 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003671
#003671
oklch(34% 0.114 255.6)
- #4D3200
#4D3200
oklch(34.1% 0.072 76)
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 #003671, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.014
- Marine #042E60 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.048
- Midnight Green #073B4C ΔE 0.071
- Midnight Blue #191970 ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.071
- Cobalt #1E488F ΔE 0.076
Use #003671 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.