#03439D
Closest named color: Cobalt (#1E488F). oklch(40.8% 0.158 259.4), rgb(3, 67, 157).
Aa
White text reads best on this color (9.15:1).
About this color
#03439D is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.158 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 9.15:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.29:1 |
| White text | 9.15:1 |
Values
| HEX | #03439D |
| RGB | rgb(3, 67, 157) |
| HSL | hsl(215, 96%, 31%) |
| OKLCH | oklch(40.8% 0.158 259.4) |
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 #03439D | 9.15:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #03439D | 2.29:1 | Fails | Lc 13.7 | Not readable |
| #03439D text on white | 9.15:1 | AAA | Lc 90.3 | Preferred for body text |
| #03439D text on black | 2.29:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9DC2FD
oklch(80.9% 0.093 259.6)
-
Step 400
400
#67A0FC
oklch(70.7% 0.148 259.6)
-
Step 500
500
#3B85F9
oklch(63.1% 0.188 259.3)
-
Step 600
600
#156BE8
oklch(55.6% 0.205 259.3)
-
Step 700
700
#0458CA
oklch(49.1% 0.191 259.4)
-
Step 800
800 (this color)
#03439D
oklch(40.8% 0.158 259.4)
-
Step 900
900
#133E81
oklch(37.6% 0.123 259.4)
-
Step 950
950
#0D254C
oklch(27% 0.078 259.7)
#03439D 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) | #004FA0 | 0.032 |
| Deuteranopia (no green cones) | #00429B | 0.005 |
| Tritanopia (no blue cones) | #005A69 | 0.120 |
| Achromatopsia (no color) | #484848 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03439D
#03439D
oklch(40.8% 0.158 259.4)
- #624300
#624300
oklch(40.7% 0.085 78.8)
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 #03439D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Sapphire #2138AB ΔE 0.036
- Twilight Blue #0A437A ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Dusk Blue #26538D ΔE 0.061
- Blueberry #464196 ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.070
- Blue Blue #2242C7 ΔE 0.071
Use #03439D 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.