#03478E
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.132 255.4), rgb(3, 71, 142).
Aa
White text reads best on this color (9.14:1).
About this color
#03478E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.132 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.016 away. White text reads best on it, at 9.14:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.29:1 |
| White text | 9.14:1 |
Values
| HEX | #03478E |
| RGB | rgb(3, 71, 142) |
| HSL | hsl(211, 96%, 28%) |
| OKLCH | oklch(40.5% 0.132 255.4) |
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 #03478E | 9.14:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #03478E | 2.29:1 | Fails | Lc 13.6 | Not readable |
| #03478E text on white | 9.14:1 | AAA | Lc 90.4 | Preferred for body text |
| #03478E text on black | 2.29:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#A0C3F3
oklch(80.9% 0.078 256.4)
-
Step 400
400
#6AA3EC
oklch(70.7% 0.123 255.2)
-
Step 500
500
#3F8AE7
oklch(63.2% 0.159 255.4)
-
Step 600
600
#1871D5
oklch(55.5% 0.173 255.5)
-
Step 700
700
#075EB8
oklch(49% 0.16 255.5)
-
Step 800
800 (this color)
#03478E
oklch(40.5% 0.132 255.4)
-
Step 900
900
#154177
oklch(37.7% 0.104 255.6)
-
Step 950
950
#0E2746
oklch(27.1% 0.066 255.2)
#03478E 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) | #1B4E91 | 0.026 |
| Deuteranopia (no green cones) | #00438D | 0.012 |
| Tritanopia (no blue cones) | #005863 | 0.099 |
| Achromatopsia (no color) | #484848 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03478E
#03478E
oklch(40.5% 0.132 255.4)
- #634100
#634100
oklch(40.4% 0.085 75.4)
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 #03478E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Twilight Blue #0A437A ΔE 0.034
- Light Navy #155084 ΔE 0.035
- Dusk Blue #26538D ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.046
- Sapphire #2138AB ΔE 0.062
- Blueberry #464196 ΔE 0.065
- Light Navy Blue #2E5A88 ΔE 0.069
Use #03478E 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.