#063866
Closest named color: Marine Blue (#01386A). oklch(33.8% 0.095 251.9), rgb(6, 56, 102).
Aa
White text reads best on this color (11.89:1).
About this color
#063866 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.095 and its hue 252°. 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 11.89:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.89:1 |
Values
| HEX | #063866 |
| RGB | rgb(6, 56, 102) |
| HSL | hsl(209, 89%, 21%) |
| OKLCH | oklch(33.8% 0.095 251.9) |
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 #063866 | 11.89:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #063866 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #063866 text on white | 11.89:1 | AAA | Lc 96.8 | Preferred for body text |
| #063866 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A0C4EE
oklch(80.9% 0.071 252.6)
-
Step 400
400
#6AA5E5
oklch(70.8% 0.113 251.5)
-
Step 500
500
#3E8CDE
oklch(63.1% 0.146 252.2)
-
Step 600
600
#1375CB
oklch(55.7% 0.157 251.5)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#09508E
oklch(42.7% 0.121 251.6)
-
Step 900
900 (this color)
#063866
oklch(33.8% 0.095 251.9)
-
Step 950
950
#0D2743
oklch(26.9% 0.061 252.5)
#063866 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) | #203C68 | 0.026 |
| Deuteranopia (no green cones) | #0E3365 | 0.015 |
| Tritanopia (no blue cones) | #00434A | 0.069 |
| Achromatopsia (no color) | #373737 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063866
#063866
oklch(33.8% 0.095 251.9)
- #4E3000
#4E3000
oklch(33.8% 0.072 71.9)
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 #063866, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.007
- Prussian Blue #1D3557 ΔE 0.030
- Marine #042E60 ΔE 0.032
- Twilight Blue #0A437A ΔE 0.046
- Midnight Green #073B4C ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.063
- Gunmetal #293241 ΔE 0.069
Use #063866 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.