#00183E
Closest named color: Navy Blue (#001146). oklch(21.8% 0.08 257.7), rgb(0, 24, 62).
Aa
White text reads best on this color (17.49:1).
About this color
#00183E is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.080 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.025 away. White text reads best on it, at 17.49:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.20:1 |
| White text | 17.49:1 |
Values
| HEX | #00183E |
| RGB | rgb(0, 24, 62) |
| HSL | hsl(217, 100%, 12%) |
| OKLCH | oklch(21.8% 0.08 257.7) |
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 #00183E | 17.49:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #00183E | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #00183E text on white | 17.49:1 | AAA | Lc 104.0 | Preferred for body text |
| #00183E text on black | 1.20:1 | 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
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFC
oklch(88.5% 0.052 257.4)
-
Step 300
300
#9AC3FE
oklch(80.9% 0.095 257.4)
-
Step 400
400
#61A1FD
oklch(70.7% 0.151 257.6)
-
Step 500
500
#3086FB
oklch(63.2% 0.193 257.5)
-
Step 600
600
#006CE7
oklch(55.5% 0.204 257.8)
-
Step 700
700
#005BC3
oklch(49.1% 0.179 257.6)
-
Step 800
800
#004AA2
oklch(42.7% 0.156 257.7)
-
Step 900
900
#0B3F83
oklch(37.8% 0.126 257.7)
-
Step 950
950 (this color)
#00183E
oklch(21.8% 0.08 257.7)
#00183E 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) | #001D3F | 0.016 |
| Deuteranopia (no green cones) | #00173D | 0.004 |
| Tritanopia (no blue cones) | #002228 | 0.061 |
| Achromatopsia (no color) | #191919 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00183E
#00183E
oklch(21.8% 0.08 257.7)
- #261700
#261700
oklch(21.9% 0.046 77.1)
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 #00183E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.025
- Rich Black #0D1B2A ΔE 0.045
- Night Blue #040348 ΔE 0.051
- Dark Navy #000435 ΔE 0.061
- Oxford Blue #1B263B ΔE 0.063
- Dark #1B2431 ΔE 0.065
- Dark Indigo #1F0954 ΔE 0.067
- Very Dark Blue #000133 ΔE 0.073
Use #00183E 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.