#00173A
Closest named color: Navy Blue (#001146). oklch(21.2% 0.075 256.9), rgb(0, 23, 58).
Aa
White text reads best on this color (17.74:1).
About this color
#00173A is a very dark, moderately saturated blue. In OKLCH its lightness is 21%, its chroma 0.075 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 17.74:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.18:1 |
| White text | 17.74:1 |
Values
| HEX | #00173A |
| RGB | rgb(0, 23, 58) |
| HSL | hsl(216, 100%, 11%) |
| OKLCH | oklch(21.2% 0.075 256.9) |
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 #00173A | 17.74:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #00173A | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #00173A text on white | 17.74:1 | AAA | Lc 104.2 | Preferred for body text |
| #00173A text on black | 1.18:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9CC3FA
oklch(80.9% 0.089 257)
-
Step 400
400
#64A2F8
oklch(70.8% 0.142 256.9)
-
Step 500
500
#3587F4
oklch(63% 0.181 257)
-
Step 600
600
#006EE3
oklch(55.7% 0.197 256.9)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800
#004B9F
oklch(42.7% 0.151 256.9)
-
Step 900
900
#0E407F
oklch(37.8% 0.118 256.8)
-
Step 950
950 (this color)
#00173A
oklch(21.2% 0.075 256.9)
#00173A 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) | #011B3B | 0.014 |
| Deuteranopia (no green cones) | #001639 | 0.004 |
| Tritanopia (no blue cones) | #002025 | 0.058 |
| Achromatopsia (no color) | #181818 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00173A
#00173A
oklch(21.2% 0.075 256.9)
- #241500
#241500
oklch(21.1% 0.044 75.5)
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 #00173A, 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 0.040
- Night Blue #040348 ΔE 0.053
- Dark Navy #000435 ΔE 0.057
- Dark #1B2431 ΔE 0.066
- Oxford Blue #1B263B ΔE 0.066
- Rich Navy #001219 ΔE 0.067
- Very Dark Blue #000133 ΔE 0.069
Use #00173A 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.