#003766
Closest named color: Marine Blue (#01386A). oklch(33.4% 0.097 251.1), rgb(0, 55, 102).
Aa
White text reads best on this color (12.08:1).
About this color
#003766 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.097 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.007 away. White text reads best on it, at 12.08:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.73:1 |
| White text | 12.08:1 |
Values
| HEX | #003766 |
| RGB | rgb(0, 55, 102) |
| HSL | hsl(208, 100%, 20%) |
| OKLCH | oklch(33.4% 0.097 251.1) |
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 #003766 | 12.08:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #003766 | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #003766 text on white | 12.08:1 | AAA | Lc 97.1 | Preferred for body text |
| #003766 text on black | 1.73:1 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9EC5EF
oklch(81% 0.073 250.6)
-
Step 400
400
#67A5E7
oklch(70.7% 0.117 251.2)
-
Step 500
500
#388DE0
oklch(63.2% 0.149 251)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900 (this color)
#003766
oklch(33.4% 0.097 251.1)
-
Step 950
950
#0C2843
oklch(27.1% 0.061 250.4)
#003766 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) | #1E3B68 | 0.027 |
| Deuteranopia (no green cones) | #093265 | 0.015 |
| Tritanopia (no blue cones) | #004249 | 0.070 |
| Achromatopsia (no color) | #363636 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003766
#003766
oklch(33.4% 0.097 251.1)
- #4D2F00
#4D2F00
oklch(33.4% 0.072 71.4)
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 #003766, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.007
- Marine #042E60 ΔE 0.028
- Prussian Blue #1D3557 ΔE 0.031
- Twilight Blue #0A437A ΔE 0.049
- Midnight Green #073B4C ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.068
- Gunmetal #293241 ΔE 0.071
Use #003766 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.