#003678
Closest named color: Marine Blue (#01386A). oklch(34.6% 0.124 257.3), rgb(0, 54, 120).
Aa
White text reads best on this color (11.67:1).
About this color
#003678 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.124 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.026 away. White text reads best on it, at 11.67:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.67:1 |
Values
| HEX | #003678 |
| RGB | rgb(0, 54, 120) |
| HSL | hsl(213, 100%, 24%) |
| OKLCH | oklch(34.6% 0.124 257.3) |
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 #003678 | 11.67:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #003678 | 1.79:1 | Fails | Lc 7.8 | Not readable |
| #003678 text on white | 11.67:1 | AAA | Lc 96.1 | Preferred for body text |
| #003678 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C4DBFC
oklch(88.5% 0.052 257.4)
-
Step 300
300
#9AC3FD
oklch(80.9% 0.094 257.1)
-
Step 400
400
#61A1FC
oklch(70.7% 0.149 257.4)
-
Step 500
500
#3086FA
oklch(63.1% 0.191 257.4)
-
Step 600
600
#006DE5
oklch(55.6% 0.201 257.4)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#004BA0
oklch(42.8% 0.152 257.1)
-
Step 900
900 (this color)
#003678
oklch(34.6% 0.124 257.3)
-
Step 950
950
#09254C
oklch(26.9% 0.08 257.7)
#003678 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) | #013E7A | 0.023 |
| Deuteranopia (no green cones) | #003377 | 0.009 |
| Tritanopia (no blue cones) | #004651 | 0.093 |
| Achromatopsia (no color) | #383838 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003678
#003678
oklch(34.6% 0.124 257.3)
- #4E3400
#4E3400
oklch(34.7% 0.072 77.9)
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 #003678, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.026
- Twilight Blue #0A437A ΔE 0.040
- Marine #042E60 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.059
- Cobalt #1E488F ΔE 0.069
- Midnight Blue #191970 ΔE 0.071
- Royal #0C1793 ΔE 0.076
- Light Navy #155084 ΔE 0.081
Use #003678 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.