#003381
Closest named color: Marine Blue (#01386A). oklch(34.7% 0.141 259.9), rgb(0, 51, 129).
Aa
White text reads best on this color (11.72:1).
About this color
#003381 is a dark, vivid blue. In OKLCH its lightness is 35%, its chroma 0.141 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.043 away. White text reads best on it, at 11.72:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.72:1 |
Values
| HEX | #003381 |
| RGB | rgb(0, 51, 129) |
| HSL | hsl(216, 100%, 25%) |
| OKLCH | oklch(34.7% 0.141 259.9) |
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 #003381 | 11.72:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #003381 | 1.79:1 | Fails | Lc 7.8 | Not readable |
| #003381 text on white | 11.72:1 | AAA | Lc 96.1 | Preferred for body text |
| #003381 text on black | 1.79:1 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DBFF
oklch(88.6% 0.056 259.3)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#659FFF
oklch(70.6% 0.154 260)
-
Step 500
500
#3883FF
oklch(63% 0.199 260)
-
Step 600
600
#0067F4
oklch(55.6% 0.226 260)
-
Step 700
700
#0056CF
oklch(49.1% 0.2 260)
-
Step 800
800
#0046AB
oklch(42.6% 0.173 259.9)
-
Step 900
900 (this color)
#003381
oklch(34.7% 0.141 259.9)
-
Step 950
950
#082451
oklch(27% 0.089 259.7)
#003381 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) | #003E84 | 0.031 |
| Deuteranopia (no green cones) | #003380 | 0.002 |
| Tritanopia (no blue cones) | #004754 | 0.107 |
| Achromatopsia (no color) | #383838 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003381
#003381
oklch(34.7% 0.141 259.9)
- #4D3500
#4D3500
oklch(34.8% 0.072 80.6)
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 #003381, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.043
- Twilight Blue #0A437A ΔE 0.049
- Marine #042E60 ΔE 0.058
- Royal #0C1793 ΔE 0.060
- Midnight Blue #191970 ΔE 0.067
- Cobalt #1E488F ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.076
- Sapphire #2138AB ΔE 0.077
Use #003381 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.