What are the hex codes in the Astro Steel Blue & Spruce palette?

The Astro Steel Blue & Spruce color palette consists of Gunmetal #003439, Spruce #006857, Steel Blue #55709F, Steel Blue #008FC2.

How should I use the Astro Steel Blue & Spruce palette on a website?

Use Steel Blue #008FC2 as the background, Gunmetal #003439 for text, Spruce #006857 for buttons and links, and Steel Blue #55709F for accents. No pair inside the palette reaches 4.5:1, so add black or white for body text.

Which colors in Astro Steel Blue & Spruce have enough contrast for text?

The highest-contrast pair is #003439 on #008FC2 with a ratio of 3.68:1, which passes WCAG AA for large text only.

#003439Gunmetal

#006857Spruce

#55709FSteel Blue

#008FC2Steel Blue

Astro Steel Blue & Spruce color palette

Space Dark Cold Gray Blue

Color codes click any value to copy

Name	HEX	RGB	HSL	OKLCH
Gunmetal	`#003439`	`rgb(0, 52, 57)`	`hsl(185, 100%, 11%)`	`oklch(29.7% 0.051 205)`
Spruce	`#006857`	`rgb(0, 104, 87)`	`hsl(170, 100%, 20%)`	`oklch(46.2% 0.086 176)`
Steel Blue	`#55709F`	`rgb(85, 112, 159)`	`hsl(218, 30%, 48%)`	`oklch(54.4% 0.081 261)`
Steel Blue	`#008FC2`	`rgb(0, 143, 194)`	`hsl(196, 100%, 38%)`	`oklch(61.1% 0.126 233)`

Why it works and how to use it

Astro Steel Blue & Spruce is a vivid dark, analogous color palette tagged space, dark, cold. Analogous neighbors on the wheel (Gunmetal, Spruce, Steel Blue) give it a natural, low-tension flow. Saturation runs high, so use the brightest color sparingly and let the others carry the surface area. The overall temperature is cool.

With 4 chromatic colors, Spruce takes the lead while the rest support. Lightness runs from 11% to 48%. Well suited to dark-mode interfaces and gaming.

Background: Steel Blue (#008FC2) is the lightest color, so it belongs on large surfaces.
Text: Gunmetal (#003439) on #008FC2 gives 3.68:1, enough for large headings only.
Primary: Spruce (#006857) is the most saturated mid-tone; use it for buttons and links with a border or a darker shade for contrast.
Accent: Steel Blue (#55709F) for highlights, badges and hover states.

No pair inside the palette reaches 4.5:1, so add black or white for body text.

Preview on a real UI see how the palette feels in context

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Design faster with Astro Steel Blue & Spruce

A palette preview that turns four colors into a page, so you can judge hierarchy, contrast and mood before you commit.

Primary action Secondary

Card title

Roles are assigned by lightness.

Color blindness simulation

#003439

#006857

#55709F

#008FC2

Color-blind check: under deuteranopia and tritanopia, Steel Blue and Steel Blue become hard to tell apart, so do not rely on that pair alone to carry meaning.

Palette card

Contrast check WCAG ratios between palette colors

Pair	Sample	Ratio	Level
`#003439` on `#008FC2`	Aa	3.68:1	AA large only
`#003439` on `#55709F`	Aa	2.71:1	Fail
`#003439` on `#006857`	Aa	2.01:1	Fail
`#006857` on `#008FC2`	Aa	1.83:1	Fail
`#55709F` on `#008FC2`	Aa	1.36:1	Fail
`#006857` on `#55709F`	Aa	1.35:1	Fail

:root {
  --gunmetal: #003439;
  --spruce: #006857;
  --steel-blue: #55709F;
  --steel-blue-4: #008FC2;
}

$gunmetal: #003439;
$spruce: #006857;
$steel-blue: #55709F;
$steel-blue-4: #008FC2;

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        'gunmetal': '#003439',
        'spruce': '#006857',
        'steel-blue': '#55709F',
        'steel-blue-4': '#008FC2',
      },
    },
  },
};

{
  "name": "Astro Steel Blue & Spruce",
  "colors": [
    "#003439",
    "#006857",
    "#55709F",
    "#008FC2"
  ]
}

background: linear-gradient(135deg, #003439, #006857, #55709F, #008FC2);

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Added 2025-06-28 · Free for commercial use, no attribution needed.

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