#03183C
Closest named color: Navy Blue (#001146). oklch(21.8% 0.075 259.4), rgb(3, 24, 60).
Aa
White text reads best on this color (17.50:1).
About this color
#03183C is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.075 and its hue 259°. 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 17.50:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.19:1 |
| White text | 17.50:1 |
Values
| HEX | #03183C |
| RGB | rgb(3, 24, 60) |
| HSL | hsl(218, 90%, 12%) |
| OKLCH | oklch(21.8% 0.075 259.4) |
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 #03183C | 17.50:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #03183C | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #03183C text on white | 17.50:1 | AAA | Lc 104.1 | Preferred for body text |
| #03183C 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9FC2FA
oklch(80.9% 0.088 259.7)
-
Step 400
400
#69A0F8
oklch(70.6% 0.142 259.4)
-
Step 500
500
#3F85F5
oklch(63% 0.182 259.5)
-
Step 600
600
#1C6CE4
oklch(55.6% 0.197 259.4)
-
Step 700
700
#0D59C6
oklch(49.1% 0.184 259.4)
-
Step 800
800
#1049A0
oklch(42.6% 0.153 259.6)
-
Step 900
900
#163F7F
oklch(37.8% 0.118 259.3)
-
Step 950
950 (this color)
#03183C
oklch(21.8% 0.075 259.4)
#03183C 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) | #021C3D | 0.013 |
| Deuteranopia (no green cones) | #00173B | 0.006 |
| Tritanopia (no blue cones) | #002127 | 0.057 |
| Achromatopsia (no color) | #191919 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03183C
#03183C
oklch(21.8% 0.075 259.4)
- #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 #03183C, 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 0.054
- Oxford Blue #1B263B ΔE 0.061
- Dark #1B2431 ΔE 0.062
- Dark Navy #000435 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.067
- Rich Navy #001219 ΔE 0.072
Use #03183C 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.