#03478F
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.134 255.6), rgb(3, 71, 143).
Aa
White text reads best on this color (9.12:1).
About this color
#03478F is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.134 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.015 away. White text reads best on it, at 9.12:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.30:1 |
| White text | 9.12:1 |
Values
| HEX | #03478F |
| RGB | rgb(3, 71, 143) |
| HSL | hsl(211, 96%, 29%) |
| OKLCH | oklch(40.5% 0.134 255.6) |
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 #03478F | 9.12:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #03478F | 2.30:1 | Fails | Lc 13.6 | Not readable |
| #03478F text on white | 9.12:1 | AAA | Lc 90.3 | Preferred for body text |
| #03478F text on black | 2.30:1 | Fails | Lc -12.0 | 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 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
#9FC3F3
oklch(80.8% 0.079 255.7)
-
Step 400
400
#6AA3ED
oklch(70.7% 0.125 255.5)
-
Step 500
500
#3F8AE8
oklch(63.2% 0.16 255.6)
-
Step 600
600
#1871D6
oklch(55.6% 0.174 255.7)
-
Step 700
700
#065EB9
oklch(49.1% 0.161 255.6)
-
Step 800
800 (this color)
#03478F
oklch(40.5% 0.134 255.6)
-
Step 900
900
#154177
oklch(37.7% 0.104 255.6)
-
Step 950
950
#0E2746
oklch(27.1% 0.066 255.2)
#03478F 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) | #1A4E92 | 0.025 |
| Deuteranopia (no green cones) | #00438E | 0.012 |
| Tritanopia (no blue cones) | #005964 | 0.101 |
| Achromatopsia (no color) | #484848 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03478F
#03478F
oklch(40.5% 0.134 255.6)
- #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 #03478F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.015
- Twilight Blue #0A437A ΔE 0.036
- Light Navy #155084 ΔE 0.036
- Dusk Blue #26538D ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.047
- Sapphire #2138AB ΔE 0.060
- Blueberry #464196 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.069
Use #03478F 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.