#004178
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.11 251.6), rgb(0, 65, 120).
Aa
White text reads best on this color (10.35:1).
About this color
#004178 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.110 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.009 away. White text reads best on it, at 10.35:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.02:1 |
| White text | 10.35:1 |
Values
| HEX | #004178 |
| RGB | rgb(0, 65, 120) |
| HSL | hsl(208, 100%, 24%) |
| OKLCH | oklch(37.3% 0.11 251.6) |
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 #004178 | 10.35:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #004178 | 2.02:1 | Fails | Lc 10.5 | Not readable |
| #004178 text on white | 10.35:1 | AAA | Lc 93.4 | Preferred for body text |
| #004178 text on black | 2.02:1 | Fails | Lc -9.1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF7
oklch(88.5% 0.045 251.4)
-
Step 300
300
#9AC5F5
oklch(81% 0.082 251.6)
-
Step 400
400
#5EA5F0
oklch(70.8% 0.132 251.3)
-
Step 500
500
#268CEB
oklch(63.2% 0.168 251.5)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900 (this color)
#004178
oklch(37.3% 0.11 251.6)
-
Step 950
950
#072747
oklch(26.9% 0.07 252)
#004178 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) | #23457A | 0.028 |
| Deuteranopia (no green cones) | #093B77 | 0.017 |
| Tritanopia (no blue cones) | #004E56 | 0.080 |
| Achromatopsia (no color) | #404040 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004178
#004178
oklch(37.3% 0.11 251.6)
- #5A3800
#5A3800
oklch(37.2% 0.08 71.7)
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 #004178, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.009
- Marine Blue #01386A ΔE 0.034
- Cobalt #1E488F ΔE 0.048
- Light Navy #155084 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.062
- Marine #042E60 ΔE 0.067
Use #004178 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.