#003661
Closest named color: Marine Blue (#01386A). oklch(32.7% 0.092 249.6), rgb(0, 54, 97).
Aa
White text reads best on this color (12.35:1).
About this color
#003661 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.092 and its hue 250°. 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 12.35:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.70:1 |
| White text | 12.35:1 |
Values
| HEX | #003661 |
| RGB | rgb(0, 54, 97) |
| HSL | hsl(207, 100%, 19%) |
| OKLCH | oklch(32.7% 0.092 249.6) |
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 #003661 | 12.35:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #003661 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #003661 text on white | 12.35:1 | AAA | Lc 97.6 | Preferred for body text |
| #003661 text on black | 1.70:1 | 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
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#9FC5EC
oklch(80.9% 0.069 249.4)
-
Step 400
400
#69A6E2
oklch(70.8% 0.109 249.2)
-
Step 500
500
#3B8EDA
oklch(63.2% 0.14 249.4)
-
Step 600
600
#0976C8
oklch(55.6% 0.153 249.7)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#03518C
oklch(42.7% 0.118 249.5)
-
Step 900
900 (this color)
#003661
oklch(32.7% 0.092 249.6)
-
Step 950
950
#0D2841
oklch(27% 0.057 249.3)
#003661 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) | #203963 | 0.028 |
| Deuteranopia (no green cones) | #0E3160 | 0.016 |
| Tritanopia (no blue cones) | #004046 | 0.065 |
| Achromatopsia (no color) | #353535 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003661
#003661
oklch(32.7% 0.092 249.6)
- #4C2D00
#4C2D00
oklch(32.8% 0.071 69.3)
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 #003661, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Marine #042E60 ΔE 0.024
- Prussian Blue #1D3557 ΔE 0.026
- Midnight Green #073B4C ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.048
- Twilight Blue #0A437A ΔE 0.057
- Gunmetal #293241 ΔE 0.064
- Space Cadet #2B2D42 ΔE 0.066
Use #003661 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.