#063771
Closest named color: Marine Blue (#01386A). oklch(34.4% 0.112 256.4), rgb(6, 55, 113).
Aa
White text reads best on this color (11.71:1).
About this color
#063771 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.112 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.013 away. White text reads best on it, at 11.71:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.71:1 |
Values
| HEX | #063771 |
| RGB | rgb(6, 55, 113) |
| HSL | hsl(213, 90%, 23%) |
| OKLCH | oklch(34.4% 0.112 256.4) |
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 #063771 | 11.71:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #063771 | 1.79:1 | Fails | Lc 7.5 | Not readable |
| #063771 text on white | 11.71:1 | AAA | Lc 96.4 | Preferred for body text |
| #063771 text on black | 1.79:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9EC3F7
oklch(80.9% 0.084 256.9)
-
Step 400
400
#67A2F3
oklch(70.7% 0.135 256.6)
-
Step 500
500
#3A88EE
oklch(63% 0.171 256.5)
-
Step 600
600
#0D6FDD
oklch(55.5% 0.187 256.5)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800
#064C9B
oklch(42.7% 0.143 256.5)
-
Step 900
900 (this color)
#063771
oklch(34.4% 0.112 256.4)
-
Step 950
950
#0C2648
oklch(26.9% 0.071 256.4)
#063771 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) | #133D73 | 0.021 |
| Deuteranopia (no green cones) | #003470 | 0.010 |
| Tritanopia (no blue cones) | #00454E | 0.084 |
| Achromatopsia (no color) | #383838 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063771
#063771
oklch(34.4% 0.112 256.4)
- #4E3300
#4E3300
oklch(34.4% 0.072 76.4)
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 #063771, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.013
- Twilight Blue #0A437A ΔE 0.038
- Marine #042E60 ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.069
- Midnight Green #073B4C ΔE 0.070
- Cobalt #1E488F ΔE 0.072
- Midnight Blue #191970 ΔE 0.074
Use #063771 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.