#00518A
Closest named color: Light Navy (#155084). oklch(42.5% 0.116 248.4), rgb(0, 81, 138).
Aa
White text reads best on this color (8.25:1).
About this color
#00518A is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.116 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.012 away. White text reads best on it, at 8.25:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.54:1 |
| White text | 8.25:1 |
Values
| HEX | #00518A |
| RGB | rgb(0, 81, 138) |
| HSL | hsl(205, 100%, 27%) |
| OKLCH | oklch(42.5% 0.116 248.4) |
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 #00518A | 8.25:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #00518A | 2.54:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #00518A text on white | 8.25:1 | AAA | Lc 87.9 | Fine for body text |
| #00518A text on black | 2.54:1 | Fails | Lc -14.2 | 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 800.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#9FC5EB
oklch(80.9% 0.068 248.7)
-
Step 400
400
#68A6E1
oklch(70.7% 0.108 248.4)
-
Step 500
500
#398ED8
oklch(63% 0.138 248.3)
-
Step 600
600
#0377C6
oklch(55.6% 0.15 248.3)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800 (this color)
#00518A
oklch(42.5% 0.116 248.4)
-
Step 900
900
#11446F
oklch(37.7% 0.09 248.7)
-
Step 950
950
#0C2841
oklch(27% 0.058 248.6)
#00518A 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) | #34558C | 0.038 |
| Deuteranopia (no green cones) | #1E4989 | 0.025 |
| Tritanopia (no blue cones) | #005F66 | 0.084 |
| Achromatopsia (no color) | #4F4F4F | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00518A
#00518A
oklch(42.5% 0.116 248.4)
- #6F4300
#6F4300
oklch(42.5% 0.093 68.3)
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 #00518A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.012
- Deep Sea Blue #015482 ΔE 0.018
- Dusk Blue #26538D ΔE 0.023
- Cobalt #1E488F ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.042
- Twilight Blue #0A437A ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.056
- Peacock Blue #016795 ΔE 0.066
Use #00518A 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.