#003964
Closest named color: Marine Blue (#01386A). oklch(33.7% 0.092 248.6), rgb(0, 57, 100).
Aa
White text reads best on this color (11.86:1).
About this color
#003964 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.092 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.012 away. White text reads best on it, at 11.86:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.86:1 |
Values
| HEX | #003964 |
| RGB | rgb(0, 57, 100) |
| HSL | hsl(206, 100%, 20%) |
| OKLCH | oklch(33.7% 0.092 248.6) |
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 #003964 | 11.86:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #003964 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #003964 text on white | 11.86:1 | AAA | Lc 96.7 | Preferred for body text |
| #003964 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9EC5EC
oklch(80.9% 0.069 248.7)
-
Step 400
400
#67A6E2
oklch(70.7% 0.11 248.5)
-
Step 500
500
#378EDA
oklch(63.1% 0.141 248.6)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900 (this color)
#003964
oklch(33.7% 0.092 248.6)
-
Step 950
950
#0B2841
oklch(26.9% 0.058 248)
#003964 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) | #233C66 | 0.030 |
| Deuteranopia (no green cones) | #123363 | 0.019 |
| Tritanopia (no blue cones) | #004349 | 0.065 |
| Achromatopsia (no color) | #373737 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003964
#003964
oklch(33.7% 0.092 248.6)
- #4F2F00
#4F2F00
oklch(33.7% 0.073 69.4)
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 #003964, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.012
- Prussian Blue #1D3557 ΔE 0.029
- Marine #042E60 ΔE 0.034
- Midnight Green #073B4C ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.047
- Twilight Blue #0A437A ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.061
- Charcoal #264653 ΔE 0.066
Use #003964 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.