#003B63
Closest named color: Marine Blue (#01386A). oklch(34.2% 0.088 246.3), rgb(0, 59, 99).
Aa
White text reads best on this color (11.62:1).
About this color
#003B63 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.088 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.017 away. White text reads best on it, at 11.62:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.62:1 |
Values
| HEX | #003B63 |
| RGB | rgb(0, 59, 99) |
| HSL | hsl(204, 100%, 19%) |
| OKLCH | oklch(34.2% 0.088 246.3) |
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 #003B63 | 11.62:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #003B63 | 1.80:1 | Fails | Lc 7.7 | Not readable |
| #003B63 text on white | 11.62:1 | AAA | Lc 96.2 | Preferred for body text |
| #003B63 text on black | 1.80:1 | 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
#E0EBF6
oklch(93.5% 0.019 248)
-
Step 200
200
#C6DCF1
oklch(88.5% 0.037 247)
-
Step 300
300
#9EC6EA
oklch(81% 0.067 245.9)
-
Step 400
400
#66A7DF
oklch(70.7% 0.106 246)
-
Step 500
500
#368FD6
oklch(63% 0.136 246.5)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900 (this color)
#003B63
oklch(34.2% 0.088 246.3)
-
Step 950
950
#0B2840
oklch(26.9% 0.056 247)
#003B63 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) | #273D65 | 0.033 |
| Deuteranopia (no green cones) | #183562 | 0.021 |
| Tritanopia (no blue cones) | #00454A | 0.062 |
| Achromatopsia (no color) | #393939 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003B63
#003B63
oklch(34.2% 0.088 246.3)
- #522F00
#522F00
oklch(34.2% 0.076 66.5)
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 #003B63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.029
- Marine #042E60 ΔE 0.040
- Midnight Green #073B4C ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.043
- Twilight Blue #0A437A ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.055
- Charcoal #264653 ΔE 0.060
Use #003B63 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.