#003D63
Closest named color: Marine Blue (#01386A). oklch(34.7% 0.086 244.4), rgb(0, 61, 99).
Aa
White text reads best on this color (11.36:1).
About this color
#003D63 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.086 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.022 away. White text reads best on it, at 11.36:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.36:1 |
Values
| HEX | #003D63 |
| RGB | rgb(0, 61, 99) |
| HSL | hsl(203, 100%, 19%) |
| OKLCH | oklch(34.7% 0.086 244.4) |
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 #003D63 | 11.36:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #003D63 | 1.84:1 | Fails | Lc 8.2 | Not readable |
| #003D63 text on white | 11.36:1 | AAA | Lc 95.7 | Preferred for body text |
| #003D63 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
#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
#9EC6E8
oklch(80.9% 0.064 244.3)
-
Step 400
400
#65A7DD
oklch(70.6% 0.104 244.7)
-
Step 500
500
#3490D3
oklch(63% 0.132 244.5)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900 (this color)
#003D63
oklch(34.7% 0.086 244.4)
-
Step 950
950
#0A293F
oklch(27.1% 0.054 243.5)
#003D63 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) | #2A3F65 | 0.036 |
| Deuteranopia (no green cones) | #1C3662 | 0.026 |
| Tritanopia (no blue cones) | #00464B | 0.058 |
| Achromatopsia (no color) | #3A3A3A | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003D63
#003D63
oklch(34.7% 0.086 244.4)
- #552F00
#552F00
oklch(34.6% 0.078 63.9)
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 #003D63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.022
- Prussian Blue #1D3557 ΔE 0.032
- Midnight Green #073B4C ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.041
- Twilight Blue #0A437A ΔE 0.043
- Marine #042E60 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.049
- Charcoal #264653 ΔE 0.054
Use #003D63 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.