#001B43
Closest named color: Navy Blue (#001146). oklch(23.1% 0.083 257.4), rgb(0, 27, 67).
Aa
White text reads best on this color (16.96:1).
About this color
#001B43 is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.083 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.029 away. White text reads best on it, at 16.96:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.23:1 |
| White text | 16.96:1 |
Values
| HEX | #001B43 |
| RGB | rgb(0, 27, 67) |
| HSL | hsl(216, 100%, 13%) |
| OKLCH | oklch(23.1% 0.083 257.4) |
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 #001B43 | 16.96:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #001B43 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #001B43 text on white | 16.96:1 | AAA | Lc 103.5 | Preferred for body text |
| #001B43 text on black | 1.23:1 | 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
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFE
oklch(88.5% 0.055 257.7)
-
Step 300
300
#99C3FF
oklch(80.9% 0.097 257.3)
-
Step 400
400
#5FA1FF
oklch(70.7% 0.154 257.4)
-
Step 500
500
#2985FF
oklch(63.1% 0.2 257.5)
-
Step 600
600
#006DE5
oklch(55.6% 0.201 257.4)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#004AA1
oklch(42.6% 0.155 257.6)
-
Step 900
900
#043E85
oklch(37.6% 0.131 257.4)
-
Step 950
950 (this color)
#001B43
oklch(23.1% 0.083 257.4)
#001B43 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) | #002044 | 0.016 |
| Deuteranopia (no green cones) | #001A42 | 0.004 |
| Tritanopia (no blue cones) | #00252B | 0.064 |
| Achromatopsia (no color) | #1C1C1C | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001B43
#001B43
oklch(23.1% 0.083 257.4)
- #2A1A00
#2A1A00
oklch(23.3% 0.049 77.5)
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 #001B43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.029
- Rich Black #0D1B2A ΔE 0.050
- Oxford Blue #1B263B ΔE 0.056
- Night Blue #040348 ΔE 0.057
- Dark #1B2431 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.063
- Darkblue #030764 ΔE 0.070
- Dark Navy #000435 ΔE 0.073
Use #001B43 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.