#00478F
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.134 255.2), rgb(0, 71, 143).
Aa
White text reads best on this color (9.13:1).
About this color
#00478F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.134 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 9.13:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.29:1 |
| White text | 9.13:1 |
Values
| HEX | #00478F |
| RGB | rgb(0, 71, 143) |
| HSL | hsl(210, 100%, 28%) |
| OKLCH | oklch(40.5% 0.134 255.2) |
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 #00478F | 9.13:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #00478F | 2.29:1 | Fails | Lc 13.6 | Not readable |
| #00478F text on white | 9.13:1 | AAA | Lc 90.3 | Preferred for body text |
| #00478F 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9FC3F3
oklch(80.8% 0.079 255.7)
-
Step 400
400
#69A3ED
oklch(70.7% 0.125 255.1)
-
Step 500
500
#3D8AE8
oklch(63.2% 0.161 255.2)
-
Step 600
600
#1471D6
oklch(55.5% 0.175 255.3)
-
Step 700
700
#015EB9
oklch(49% 0.162 255.2)
-
Step 800
800 (this color)
#00478F
oklch(40.5% 0.134 255.2)
-
Step 900
900
#144177
oklch(37.6% 0.104 255.3)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#00478F 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 | 0.026 |
| Deuteranopia (no green cones) | #00438E | 0.011 |
| 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°).
- #00478F
#00478F
oklch(40.5% 0.134 255.2)
- #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 #00478F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Twilight Blue #0A437A ΔE 0.036
- Light Navy #155084 ΔE 0.036
- Dusk Blue #26538D ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.047
- Sapphire #2138AB ΔE 0.061
- Blueberry #464196 ΔE 0.066
- Light Navy Blue #2E5A88 ΔE 0.070
Use #00478F 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.