#18518C
Closest named color: Dusk Blue (#26538D). oklch(43.1% 0.113 252.8), rgb(24, 81, 140).
Aa
White text reads best on this color (8.09:1).
About this color
#18518C is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.113 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.013 away. White text reads best on it, at 8.09:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.59:1 |
| White text | 8.09:1 |
Values
| HEX | #18518C |
| RGB | rgb(24, 81, 140) |
| HSL | hsl(211, 71%, 32%) |
| OKLCH | oklch(43.1% 0.113 252.8) |
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 #18518C | 8.09:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #18518C | 2.59:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #18518C text on white | 8.09:1 | AAA | Lc 87.6 | Fine for body text |
| #18518C text on black | 2.59:1 | Fails | Lc -14.5 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A3C4EB
oklch(81% 0.066 252.8)
-
Step 400
400
#6FA4E1
oklch(70.6% 0.106 252.7)
-
Step 500
500
#478CD9
oklch(63.1% 0.136 252.9)
-
Step 600
600
#2575C6
oklch(55.7% 0.147 252.5)
-
Step 700
700
#1761AB
oklch(49% 0.137 253)
-
Step 800
800 (this color)
#18518C
oklch(43.1% 0.113 252.8)
-
Step 900
900
#1A436F
oklch(37.8% 0.088 252.6)
-
Step 950
950
#102741
oklch(26.9% 0.057 253.1)
#18518C 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) | #34558E | 0.029 |
| Deuteranopia (no green cones) | #204B8B | 0.017 |
| Tritanopia (no blue cones) | #005F67 | 0.085 |
| Achromatopsia (no color) | #505050 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18518C
#18518C
oklch(43.1% 0.113 252.8)
- #6E4700
#6E4700
oklch(43.2% 0.092 73.5)
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 #18518C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.013
- Light Navy #155084 ΔE 0.014
- Deep Sea Blue #015482 ΔE 0.023
- Cobalt #1E488F ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.050
- Twilight #4E518B ΔE 0.059
Use #18518C 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.