#003B72
Closest named color: Marine Blue (#01386A). oklch(35.3% 0.109 253.1), rgb(0, 59, 114).
Aa
White text reads best on this color (11.23:1).
About this color
#003B72 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.109 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.016 away. White text reads best on it, at 11.23:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.23:1 |
Values
| HEX | #003B72 |
| RGB | rgb(0, 59, 114) |
| HSL | hsl(209, 100%, 22%) |
| OKLCH | oklch(35.3% 0.109 253.1) |
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 #003B72 | 11.23:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #003B72 | 1.86:1 | Fails | Lc 8.6 | Not readable |
| #003B72 text on white | 11.23:1 | AAA | Lc 95.3 | Preferred for body text |
| #003B72 text on black | 1.86:1 | Fails | Lc -7.3 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DCF7
oklch(88.6% 0.045 252.5)
-
Step 300
300
#9BC4F5
oklch(80.8% 0.082 253.2)
-
Step 400
400
#62A4F0
oklch(70.7% 0.131 253.1)
-
Step 500
500
#2F8BEB
oklch(63.2% 0.167 253)
-
Step 600
600
#0073D4
oklch(55.6% 0.172 253.1)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900 (this color)
#003B72
oklch(35.3% 0.109 253.1)
-
Step 950
950
#092747
oklch(27% 0.069 253.1)
#003B72 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) | #1C4074 | 0.026 |
| Deuteranopia (no green cones) | #003671 | 0.015 |
| Tritanopia (no blue cones) | #004851 | 0.079 |
| Achromatopsia (no color) | #3B3B3B | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003B72
#003B72
oklch(35.3% 0.109 253.1)
- #533400
#533400
oklch(35.4% 0.075 72.8)
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 #003B72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Twilight Blue #0A437A ΔE 0.028
- Marine #042E60 ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.049
- Cobalt #1E488F ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.067
- Midnight Green #073B4C ΔE 0.068
Use #003B72 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.