#063C66
Closest named color: Marine Blue (#01386A). oklch(34.8% 0.09 248.5), rgb(6, 60, 102).
Aa
White text reads best on this color (11.37:1).
About this color
#063C66 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.090 and its hue 249°. 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 11.37:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.37:1 |
Values
| HEX | #063C66 |
| RGB | rgb(6, 60, 102) |
| HSL | hsl(206, 89%, 21%) |
| OKLCH | oklch(34.8% 0.09 248.5) |
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 #063C66 | 11.37:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #063C66 | 1.84:1 | Fails | Lc 8.1 | Not readable |
| #063C66 text on white | 11.37:1 | AAA | Lc 95.8 | Preferred for body text |
| #063C66 text on black | 1.84:1 | 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
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#9FC5EB
oklch(80.9% 0.068 248.7)
-
Step 400
400
#68A6E1
oklch(70.7% 0.108 248.4)
-
Step 500
500
#3A8ED8
oklch(63% 0.138 248.5)
-
Step 600
600
#0577C6
oklch(55.7% 0.15 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#02518A
oklch(42.6% 0.115 248.6)
-
Step 900
900 (this color)
#063C66
oklch(34.8% 0.09 248.5)
-
Step 950
950
#0C2841
oklch(27% 0.058 248.6)
#063C66 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) | #273E68 | 0.029 |
| Deuteranopia (no green cones) | #183665 | 0.020 |
| Tritanopia (no blue cones) | #00464C | 0.063 |
| Achromatopsia (no color) | #3A3A3A | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063C66
#063C66
oklch(34.8% 0.09 248.5)
- #533100
#533100
oklch(34.7% 0.076 68.5)
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 #063C66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Prussian Blue #1D3557 ΔE 0.032
- Twilight Blue #0A437A ΔE 0.039
- Marine #042E60 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.046
- Midnight Green #073B4C ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.052
- Charcoal #264653 ΔE 0.059
Use #063C66 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.