#18538D
Closest named color: Dusk Blue (#26538D). oklch(43.7% 0.113 251.9), rgb(24, 83, 141).
Aa
White text reads best on this color (7.89:1).
About this color
#18538D is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.113 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.010 away. White text reads best on it, at 7.89:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.66:1 |
| White text | 7.89:1 |
Values
| HEX | #18538D |
| RGB | rgb(24, 83, 141) |
| HSL | hsl(210, 71%, 32%) |
| OKLCH | oklch(43.7% 0.113 251.9) |
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 #18538D | 7.89:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #18538D | 2.66:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #18538D text on white | 7.89:1 | AAA | Lc 87.0 | Fine for body text |
| #18538D text on black | 2.66:1 | Fails | Lc -15.1 | Dividers and decoration only |
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
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A2C4EB
oklch(80.9% 0.066 252.1)
-
Step 400
400
#6FA5E0
oklch(70.8% 0.104 251.5)
-
Step 500
500
#468DD8
oklch(63.2% 0.134 251.8)
-
Step 600
600
#2275C5
oklch(55.6% 0.146 251.8)
-
Step 700
700
#1362AA
oklch(49.1% 0.135 251.6)
-
Step 800
800 (this color)
#18538D
oklch(43.7% 0.113 251.9)
-
Step 900
900
#19436E
oklch(37.7% 0.087 251.7)
-
Step 950
950
#102841
oklch(27.2% 0.056 251.4)
#18538D 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) | #37578F | 0.032 |
| Deuteranopia (no green cones) | #234D8C | 0.017 |
| Tritanopia (no blue cones) | #006169 | 0.084 |
| Achromatopsia (no color) | #515151 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18538D
#18538D
oklch(43.7% 0.113 251.9)
- #714700
#714700
oklch(43.6% 0.094 71.2)
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 #18538D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.010
- Light Navy #155084 ΔE 0.017
- Deep Sea Blue #015482 ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.031
- Cobalt #1E488F ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.056
- Twilight #4E518B ΔE 0.058
Use #18538D 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.