#003371
Closest named color: Marine Blue (#01386A). oklch(33.3% 0.118 257.1), rgb(0, 51, 113).
Aa
White text reads best on this color (12.26:1).
About this color
#003371 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.118 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.020 away. White text reads best on it, at 12.26:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.26:1 |
Values
| HEX | #003371 |
| RGB | rgb(0, 51, 113) |
| HSL | hsl(213, 100%, 22%) |
| OKLCH | oklch(33.3% 0.118 257.1) |
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 #003371 | 12.26:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #003371 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #003371 text on white | 12.26:1 | AAA | Lc 97.3 | Preferred for body text |
| #003371 text on black | 1.71:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9CC3FA
oklch(80.9% 0.089 257)
-
Step 400
400
#64A2F8
oklch(70.8% 0.142 256.9)
-
Step 500
500
#3687F4
oklch(63.1% 0.181 257.1)
-
Step 600
600
#016EE3
oklch(55.7% 0.197 257)
-
Step 700
700
#005CC1
oklch(49.2% 0.175 257.1)
-
Step 800
800
#004BA0
oklch(42.8% 0.152 257.1)
-
Step 900
900 (this color)
#003371
oklch(33.3% 0.118 257.1)
-
Step 950
950
#0B264A
oklch(27.1% 0.074 256.8)
#003371 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) | #033A73 | 0.021 |
| Deuteranopia (no green cones) | #003070 | 0.009 |
| Tritanopia (no blue cones) | #00424C | 0.089 |
| Achromatopsia (no color) | #353535 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003371
#003371
oklch(33.3% 0.118 257.1)
- #4A3000
#4A3000
oklch(33.2% 0.07 76.2)
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 #003371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.020
- Marine #042E60 ΔE 0.032
- Twilight Blue #0A437A ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.051
- Midnight Blue #191970 ΔE 0.062
- Midnight Green #073B4C ΔE 0.075
- Dark Blue Grey #1F3B4D ΔE 0.076
- Royal #0C1793 ΔE 0.079
Use #003371 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.