#003A64
Closest named color: Marine Blue (#01386A). oklch(34% 0.091 247.8), rgb(0, 58, 100).
Aa
White text reads best on this color (11.73:1).
About this color
#003A64 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.091 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.013 away. White text reads best on it, at 11.73:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.78:1 |
| White text | 11.73:1 |
Values
| HEX | #003A64 |
| RGB | rgb(0, 58, 100) |
| HSL | hsl(205, 100%, 20%) |
| OKLCH | oklch(34% 0.091 247.8) |
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 #003A64 | 11.73:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #003A64 | 1.78:1 | Fails | Lc 7.5 | Not readable |
| #003A64 text on white | 11.73:1 | AAA | Lc 96.4 | Preferred for body text |
| #003A64 text on black | 1.78:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
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
#9EC5EB
oklch(80.8% 0.068 248)
-
Step 400
400
#66A6E1
oklch(70.6% 0.109 247.7)
-
Step 500
500
#368FD9
oklch(63.2% 0.139 247.5)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900 (this color)
#003A64
oklch(34% 0.091 247.8)
-
Step 950
950
#0B2841
oklch(26.9% 0.058 248)
#003A64 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) | #253C66 | 0.031 |
| Deuteranopia (no green cones) | #153463 | 0.020 |
| Tritanopia (no blue cones) | #00444A | 0.064 |
| Achromatopsia (no color) | #383838 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003A64
#003A64
oklch(34% 0.091 247.8)
- #512F00
#512F00
oklch(34% 0.075 67.5)
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 #003A64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.013
- Prussian Blue #1D3557 ΔE 0.029
- Marine #042E60 ΔE 0.037
- Midnight Green #073B4C ΔE 0.044
- Twilight Blue #0A437A ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.058
- Charcoal #264653 ΔE 0.064
Use #003A64 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.