#0B2447
#3B5C9E
#6E86D6
#A5D7E8
#083B64Prussian Blue
#1B72A0Cerulean
#8DB9C8Dusty Blue
#D1DCE1Fog
Royal Cerulean & Prussian Blue is a monochromatic color palette tagged cold, blue. All four colors sit within 12° of hue, so the scheme reads as one color explored across light and dark. Neither washed out nor loud, it adapts to most contexts. The overall temperature is cool.
Color codes click any value to copy
| Swatch | Name | HEX | RGB | HSL | OKLCH |
|---|---|---|---|---|---|
| Prussian Blue | #083B64 | rgb(8, 59, 100) | hsl(207, 85%, 21%) | oklch(34.4% 0.088 249) | |
| Cerulean | #1B72A0 | rgb(27, 114, 160) | hsl(201, 71%, 37%) | oklch(52.5% 0.106 238) | |
| Dusty Blue | #8DB9C8 | rgb(141, 185, 200) | hsl(195, 35%, 67%) | oklch(75.9% 0.051 221) | |
| Fog | #D1DCE1 | rgb(209, 220, 225) | hsl(199, 21%, 85%) | oklch(88.8% 0.014 227) |
Why it works and how to use it
It works because the lightness range is wide (21% to 85%), which gives clear hierarchy between background, content and accents. Try it for websites, presentations and branding.
- Background: Fog (#D1DCE1) is the lightest color, so it belongs on large surfaces.
- Text: Prussian Blue (#083B64) on #D1DCE1 gives 8.26:1, passing WCAG AAA.
- Primary: Cerulean (#1B72A0) is the most saturated mid-tone; use it for buttons and links (3.8:1 against the background, fine for UI elements).
- Accent: Dusty Blue (#8DB9C8) for highlights, badges and hover states.
2 of 6 color pairs pass WCAG AA (4.5:1); the strongest is Prussian Blue on Fog at 8.26:1.
Preview on a real UI see how the palette feels in context
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Design faster with Royal Cerulean & Prussian Blue
A palette preview that turns four colors into a page, so you can judge hierarchy, contrast and mood before you commit.
Primary action SecondaryCard title
Card title
Card title
Roles are assigned by lightness.
Color blindness simulation
#083B64
#1B72A0
#8DB9C8
#D1DCE1
Color-blind check: all four colors stay distinguishable under protanopia, deuteranopia and tritanopia.
Contrast check WCAG ratios between palette colors
| Pair | Sample | Ratio | Level |
|---|---|---|---|
#083B64 on #D1DCE1 | Aa | 8.26:1 | AAA |
#083B64 on #8DB9C8 | Aa | 5.44:1 | AA |
#1B72A0 on #D1DCE1 | Aa | 3.8:1 | AA large only |
#1B72A0 on #8DB9C8 | Aa | 2.5:1 | Fail |
#083B64 on #1B72A0 | Aa | 2.18:1 | Fail |
#8DB9C8 on #D1DCE1 | Aa | 1.52:1 | Fail |
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