#003C63
Closest named color: Marine Blue (#01386A). oklch(34.5% 0.087 245.3), rgb(0, 60, 99).
Aa
White text reads best on this color (11.49:1).
About this color
#003C63 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.087 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.019 away. White text reads best on it, at 11.49:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.82:1 |
| White text | 11.49:1 |
Values
| HEX | #003C63 |
| RGB | rgb(0, 60, 99) |
| HSL | hsl(204, 100%, 19%) |
| OKLCH | oklch(34.5% 0.087 245.3) |
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 #003C63 | 11.49:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #003C63 | 1.82:1 | Fails | Lc 7.9 | Not readable |
| #003C63 text on white | 11.49:1 | AAA | Lc 96.0 | Preferred for body text |
| #003C63 text on black | 1.82:1 | 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
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C6DCF0
oklch(88.4% 0.036 245.7)
-
Step 300
300
#9EC6E9
oklch(81% 0.065 245.1)
-
Step 400
400
#66A7DE
oklch(70.7% 0.105 245.6)
-
Step 500
500
#3590D5
oklch(63.2% 0.134 245.4)
-
Step 600
600
#0079C0
oklch(55.7% 0.141 245.3)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900 (this color)
#003C63
oklch(34.5% 0.087 245.3)
-
Step 950
950
#0B2940
oklch(27.2% 0.055 245.2)
#003C63 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) | #293E65 | 0.035 |
| Deuteranopia (no green cones) | #1A3662 | 0.022 |
| Tritanopia (no blue cones) | #00464A | 0.062 |
| Achromatopsia (no color) | #393939 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003C63
#003C63
oklch(34.5% 0.087 245.3)
- #542F00
#542F00
oklch(34.5% 0.077 64.8)
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 #003C63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.019
- Prussian Blue #1D3557 ΔE 0.030
- Midnight Green #073B4C ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.042
- Marine #042E60 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.052
- Charcoal #264653 ΔE 0.057
Use #003C63 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.