#00478A
Closest named color: Cobalt (#1E488F). oklch(40.1% 0.128 254), rgb(0, 71, 138).
Aa
White text reads best on this color (9.25:1).
About this color
#00478A is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.128 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.019 away. White text reads best on it, at 9.25:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #00478A |
| RGB | rgb(0, 71, 138) |
| HSL | hsl(209, 100%, 27%) |
| OKLCH | oklch(40.1% 0.128 254) |
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 #00478A | 9.25:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #00478A | 2.26:1 | Fails | Lc 13.3 | Not readable |
| #00478A text on white | 9.25:1 | AAA | Lc 90.7 | Preferred for body text |
| #00478A text on black | 2.26:1 | Fails | Lc -11.6 | 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
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C2DCFC
oklch(88.6% 0.052 253.7)
-
Step 300
300
#95C4FE
oklch(80.9% 0.097 254.1)
-
Step 400
400
#56A3FD
oklch(70.7% 0.153 253.8)
-
Step 500
500
#0F88FB
oklch(63% 0.196 254)
-
Step 600
600
#0072D7
oklch(55.6% 0.177 254)
-
Step 700
700
#0060B6
oklch(49.2% 0.156 253.8)
-
Step 800
800
#004E96
oklch(42.7% 0.135 253.8)
-
Step 900
900 (this color)
#00478A
oklch(40.1% 0.128 254)
-
Step 950
950
#03264C
oklch(26.9% 0.08 254)
#00478A 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) | #204D8D | 0.027 |
| Deuteranopia (no green cones) | #004289 | 0.014 |
| Tritanopia (no blue cones) | #005761 | 0.094 |
| Achromatopsia (no color) | #474747 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00478A
#00478A
oklch(40.1% 0.128 254)
- #634000
#634000
oklch(40.2% 0.085 74.1)
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 #00478A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.019
- Twilight Blue #0A437A ΔE 0.028
- Light Navy #155084 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.043
- Dusk Blue #26538D ΔE 0.045
- Marine Blue #01386A ΔE 0.067
- Sapphire #2138AB ΔE 0.068
- Light Navy Blue #2E5A88 ΔE 0.069
Use #00478A 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.