#001B4E
Closest named color: Navy Blue (#001146). oklch(24.2% 0.1 260.3), rgb(0, 27, 78).
Aa
White text reads best on this color (16.57:1).
About this color
#001B4E is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.100 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.032 away. White text reads best on it, at 16.57:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.26:1 |
| White text | 16.57:1 |
Values
| HEX | #001B4E |
| RGB | rgb(0, 27, 78) |
| HSL | hsl(219, 100%, 15%) |
| OKLCH | oklch(24.2% 0.1 260.3) |
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 #001B4E | 16.57:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #001B4E | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #001B4E text on white | 16.57:1 | AAA | Lc 103.0 | Preferred for body text |
| #001B4E text on black | 1.26:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3A83FF
oklch(63.1% 0.199 260.3)
-
Step 600
600
#0066F6
oklch(55.6% 0.23 260.3)
-
Step 700
700
#0055D1
oklch(49.1% 0.204 260.3)
-
Step 800
800
#0045AD
oklch(42.6% 0.177 260.3)
-
Step 900
900
#003992
oklch(37.6% 0.156 260.3)
-
Step 950
950 (this color)
#001B4E
oklch(24.2% 0.1 260.3)
#001B4E 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) | #002250 | 0.021 |
| Deuteranopia (no green cones) | #001B4D | 0.002 |
| Tritanopia (no blue cones) | #002831 | 0.075 |
| Achromatopsia (no color) | #1E1E1E | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001B4E
#001B4E
oklch(24.2% 0.1 260.3)
- #2C1D00
#2C1D00
oklch(24.3% 0.05 81.3)
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 #001B4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.032
- Darkblue #030764 ΔE 0.052
- Dark Indigo #1F0954 ΔE 0.054
- Night Blue #040348 ΔE 0.057
- Oxford Blue #1B263B ΔE 0.064
- Marine #042E60 ΔE 0.065
- Dark Royal Blue #02066F ΔE 0.066
- Midnight Blue #191970 ΔE 0.069
Use #001B4E 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.