#03183A
Closest named color: Navy Blue (#001146). oklch(21.6% 0.072 258.7), rgb(3, 24, 58).
Aa
White text reads best on this color (17.56:1).
About this color
#03183A is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.072 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.031 away. White text reads best on it, at 17.56:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.19:1 |
| White text | 17.56:1 |
Values
| HEX | #03183A |
| RGB | rgb(3, 24, 58) |
| HSL | hsl(217, 90%, 12%) |
| OKLCH | oklch(21.6% 0.072 258.7) |
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 #03183A | 17.56:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #03183A | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #03183A text on white | 17.56:1 | AAA | Lc 104.1 | Preferred for body text |
| #03183A text on black | 1.19:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DBF9
oklch(88.6% 0.047 258.4)
-
Step 300
300
#9FC2F8
oklch(80.8% 0.086 258.9)
-
Step 400
400
#6AA1F4
oklch(70.7% 0.136 258.4)
-
Step 500
500
#4187F0
oklch(63.2% 0.173 258.5)
-
Step 600
600
#1E6DDF
oklch(55.5% 0.189 258.8)
-
Step 700
700
#0F5BC2
oklch(49.2% 0.176 258.6)
-
Step 800
800
#114B9D
oklch(42.8% 0.146 258.6)
-
Step 900
900
#163F7C
oklch(37.6% 0.113 258.6)
-
Step 950
950 (this color)
#03183A
oklch(21.6% 0.072 258.7)
#03183A 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) | #041C3B | 0.014 |
| Deuteranopia (no green cones) | #001739 | 0.006 |
| Tritanopia (no blue cones) | #002026 | 0.054 |
| Achromatopsia (no color) | #191919 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03183A
#03183A
oklch(21.6% 0.072 258.7)
- #251700
#251700
oklch(21.7% 0.045 79.1)
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 #03183A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.031
- Rich Black #0D1B2A ΔE 0.037
- Night Blue #040348 ΔE 0.056
- Dark #1B2431 ΔE 0.061
- Oxford Blue #1B263B ΔE 0.061
- Dark Navy #000435 ΔE 0.062
- Rich Navy #001219 ΔE 0.069
- Dark Indigo #1F0954 ΔE 0.070
Use #03183A 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.