#063371
Closest named color: Marine Blue (#01386A). oklch(33.4% 0.117 258.4), rgb(6, 51, 113).
Aa
White text reads best on this color (12.21:1).
About this color
#063371 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.117 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.020 away. White text reads best on it, at 12.21:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.21:1 |
Values
| HEX | #063371 |
| RGB | rgb(6, 51, 113) |
| HSL | hsl(215, 90%, 23%) |
| OKLCH | oklch(33.4% 0.117 258.4) |
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 #063371 | 12.21:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #063371 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #063371 text on white | 12.21:1 | AAA | Lc 97.3 | Preferred for body text |
| #063371 text on black | 1.71:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9EC3FA
oklch(81% 0.088 258.1)
-
Step 400
400
#68A1F7
oklch(70.7% 0.14 258.4)
-
Step 500
500
#3D86F3
oklch(63% 0.179 258.5)
-
Step 600
600
#166DE2
oklch(55.6% 0.195 258.3)
-
Step 700
700
#055AC5
oklch(49.1% 0.182 258.5)
-
Step 800
800
#0C4A9F
oklch(42.6% 0.151 258.6)
-
Step 900
900 (this color)
#063371
oklch(33.4% 0.117 258.4)
-
Step 950
950
#0D254A
oklch(26.9% 0.075 258.9)
#063371 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) | #043A73 | 0.020 |
| Deuteranopia (no green cones) | #003170 | 0.008 |
| Tritanopia (no blue cones) | #00424C | 0.089 |
| Achromatopsia (no color) | #353535 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063371
#063371
oklch(33.4% 0.117 258.4)
- #4A3100
#4A3100
oklch(33.4% 0.07 77.7)
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 #063371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.020
- Marine #042E60 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.050
- Midnight Blue #191970 ΔE 0.062
- Midnight Green #073B4C ΔE 0.075
- Dark Blue Grey #1F3B4D ΔE 0.075
- Royal #0C1793 ΔE 0.079
Use #063371 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.