#063B6B
Closest named color: Marine Blue (#01386A). oklch(34.9% 0.098 251.7), rgb(6, 59, 107).
Aa
White text reads best on this color (11.37:1).
About this color
#063B6B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.098 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.010 away. White text reads best on it, at 11.37:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.37:1 |
Values
| HEX | #063B6B |
| RGB | rgb(6, 59, 107) |
| HSL | hsl(209, 89%, 22%) |
| OKLCH | oklch(34.9% 0.098 251.7) |
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 #063B6B | 11.37:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #063B6B | 1.84:1 | Fails | Lc 8.1 | Not readable |
| #063B6B text on white | 11.37:1 | AAA | Lc 95.8 | Preferred for body text |
| #063B6B 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
#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
#9EC4EF
oklch(80.8% 0.074 251.8)
-
Step 400
400
#67A5E8
oklch(70.8% 0.118 251.5)
-
Step 500
500
#398CE1
oklch(63.1% 0.151 251.9)
-
Step 600
600
#0574CF
oklch(55.6% 0.164 252)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#025091
oklch(42.8% 0.126 251.7)
-
Step 900
900 (this color)
#063B6B
oklch(34.9% 0.098 251.7)
-
Step 950
950
#0C2744
oklch(26.9% 0.063 252.6)
#063B6B 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) | #223F6D | 0.027 |
| Deuteranopia (no green cones) | #0F366A | 0.015 |
| Tritanopia (no blue cones) | #00474D | 0.074 |
| Achromatopsia (no color) | #3A3A3A | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063B6B
#063B6B
oklch(34.9% 0.098 251.7)
- #523300
#523300
oklch(35% 0.075 72.3)
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 #063B6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.010
- Twilight Blue #0A437A ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.038
- Marine #042E60 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.055
- Midnight Green #073B4C ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.059
- Charcoal #264653 ΔE 0.067
Use #063B6B 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.