#03406B
Closest named color: Marine Blue (#01386A). oklch(36.1% 0.093 247), rgb(3, 64, 107).
Aa
White text reads best on this color (10.77:1).
About this color
#03406B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.093 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 10.77:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #03406B |
| RGB | rgb(3, 64, 107) |
| HSL | hsl(205, 95%, 22%) |
| OKLCH | oklch(36.1% 0.093 247) |
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 #03406B | 10.77:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #03406B | 1.94:1 | Fails | Lc 9.5 | Not readable |
| #03406B text on white | 10.77:1 | AAA | Lc 94.5 | Preferred for body text |
| #03406B text on black | 1.94:1 | Fails | Lc -8.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C5DCF2
oklch(88.4% 0.039 247.1)
-
Step 300
300
#9DC6EC
oklch(81% 0.069 246.7)
-
Step 400
400
#64A7E2
oklch(70.8% 0.111 246.7)
-
Step 500
500
#318FDA
oklch(63.1% 0.142 247)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900 (this color)
#03406B
oklch(36.1% 0.093 247)
-
Step 950
950
#0A2841
oklch(26.9% 0.058 247.4)
#03406B 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) | #2B426D | 0.034 |
| Deuteranopia (no green cones) | #1B3A6A | 0.021 |
| Tritanopia (no blue cones) | #004A50 | 0.064 |
| Achromatopsia (no color) | #3E3E3E | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03406B
#03406B
oklch(36.1% 0.093 247)
- #593400
#593400
oklch(36.2% 0.08 67.3)
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 #03406B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Twilight Blue #0A437A ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.052
- Midnight Green #073B4C ΔE 0.054
- Charcoal #264653 ΔE 0.056
- Marine #042E60 ΔE 0.057
Use #03406B 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.