#003A5D
Closest named color: Prussian Blue (#1D3557). oklch(33.5% 0.082 243.3), rgb(0, 58, 93).
Aa
White text reads best on this color (11.90:1).
About this color
#003A5D is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.082 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.024 away. White text reads best on it, at 11.90:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.90:1 |
Values
| HEX | #003A5D |
| RGB | rgb(0, 58, 93) |
| HSL | hsl(203, 100%, 18%) |
| OKLCH | oklch(33.5% 0.082 243.3) |
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 #003A5D | 11.90:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #003A5D | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #003A5D text on white | 11.90:1 | AAA | Lc 96.8 | Preferred for body text |
| #003A5D 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCEE
oklch(88.4% 0.034 244)
-
Step 300
300
#9FC6E6
oklch(80.9% 0.062 243.3)
-
Step 400
400
#68A8D9
oklch(70.8% 0.098 242.8)
-
Step 500
500
#3991CF
oklch(63.2% 0.125 243.2)
-
Step 600
600
#007ABC
oklch(55.7% 0.136 243.3)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900 (this color)
#003A5D
oklch(33.5% 0.082 243.3)
-
Step 950
950
#0C293E
oklch(27.1% 0.052 243.5)
#003A5D 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) | #293B5E | 0.035 |
| Deuteranopia (no green cones) | #1C335C | 0.027 |
| Tritanopia (no blue cones) | #004347 | 0.056 |
| Achromatopsia (no color) | #373737 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003A5D
#003A5D
oklch(33.5% 0.082 243.3)
- #512C00
#512C00
oklch(33.4% 0.076 63.2)
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 #003A5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.024
- Marine Blue #01386A ΔE 0.025
- Midnight Green #073B4C ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.036
- Marine #042E60 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.056
- Gunmetal #293241 ΔE 0.057
Use #003A5D 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.