What are the hex codes in the Slate & Prussian Blue Hour palette?

The Slate & Prussian Blue Hour color palette consists of Obsidian #01030E, Prussian Blue #203148, Slate #5A718F, Oat #DAD5C3.

How should I use the Slate & Prussian Blue Hour palette on a website?

Use Oat #DAD5C3 as the background, Obsidian #01030E for text, Prussian Blue #203148 for buttons and links, and Slate #5A718F for accents. 2 of 6 color pairs pass WCAG AA (4.5:1); the strongest is Obsidian on Oat at 14:1.

Which colors in Slate & Prussian Blue Hour have enough contrast for text?

The highest-contrast pair is #01030E on #DAD5C3 with a ratio of 14:1, which passes WCAG AA for normal text.

#01030EObsidian

#203148Prussian Blue

#5A718FSlate

#DAD5C3Oat

Slate & Prussian Blue Hour color palette

Dark Muted Minimal Black Gray

Color codes click any value to copy

Name	HEX	RGB	HSL	OKLCH
Obsidian	`#01030E`	`rgb(1, 3, 14)`	`hsl(231, 87%, 3%)`	`oklch(10.3% 0.033 265)`
Prussian Blue	`#203148`	`rgb(32, 49, 72)`	`hsl(215, 38%, 20%)`	`oklch(31.0% 0.047 256)`
Slate	`#5A718F`	`rgb(90, 113, 143)`	`hsl(214, 23%, 46%)`	`oklch(54.2% 0.055 255)`
Oat	`#DAD5C3`	`rgb(218, 213, 195)`	`hsl(47, 24%, 81%)`	`oklch(87.2% 0.025 94)`

Why it works and how to use it

Slate & Prussian Blue Hour is a dark, complementary color palette tagged dark, muted, minimal. Near-complementary hues (about 168° apart) make this a high-contrast, attention-grabbing combination. Saturation is moderate, which keeps it flexible for both interfaces and print. Warm and cool hues are mixed, which adds depth.

The palette holds together thanks to its complementary hue relationship and a strong light-to-dark ladder (81% down to 3% lightness). A natural fit for dark-mode interfaces and gaming.

Background: Oat (#DAD5C3) is the lightest color, so it belongs on large surfaces.
Text: Obsidian (#01030E) on #DAD5C3 gives 14:1, passing WCAG AAA.
Primary: Prussian Blue (#203148) is the most saturated mid-tone; use it for buttons and links (8.96:1 against the background, fine for UI elements).
Accent: Slate (#5A718F) for highlights, badges and hover states.

2 of 6 color pairs pass WCAG AA (4.5:1); the strongest is Obsidian on Oat at 14:1.

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

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Design faster with Slate & Prussian Blue Hour

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

#01030E

#203148

#5A718F

#DAD5C3

Color-blind check: all four colors stay distinguishable under protanopia, deuteranopia and tritanopia.

Palette card

Contrast check WCAG ratios between palette colors

Pair	Sample	Ratio	Level
`#01030E` on `#DAD5C3`	Aa	14:1	AAA
`#203148` on `#DAD5C3`	Aa	8.96:1	AAA
`#01030E` on `#5A718F`	Aa	4.11:1	AA large only
`#5A718F` on `#DAD5C3`	Aa	3.41:1	AA large only
`#203148` on `#5A718F`	Aa	2.63:1	Fail
`#01030E` on `#203148`	Aa	1.56:1	Fail

:root {
  --obsidian: #01030E;
  --prussian-blue: #203148;
  --slate: #5A718F;
  --oat: #DAD5C3;
}

$obsidian: #01030E;
$prussian-blue: #203148;
$slate: #5A718F;
$oat: #DAD5C3;

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        'obsidian': '#01030E',
        'prussian-blue': '#203148',
        'slate': '#5A718F',
        'oat': '#DAD5C3',
      },
    },
  },
};

{
  "name": "Slate & Prussian Blue Hour",
  "colors": [
    "#01030E",
    "#203148",
    "#5A718F",
    "#DAD5C3"
  ]
}

background: linear-gradient(135deg, #01030E, #203148, #5A718F, #DAD5C3);

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Added 2025-11-07 · Free for commercial use, no attribution needed.

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