#0D47A1
#1976D2
#64B5F6
#E3F2FD
#46399ECobalt
#5F68D3Slate Blue
#8CAAFCCornflower
#E3F2FDFrost
Royal Slate Blue & Cobalt is a vivid analogous color palette tagged gradient, vibrant, cold. The hues stay within 43° of each other on the color wheel, which is why the palette feels cohesive rather than busy. These are bold, punchy colors that need generous white space around them. The overall temperature is cool.
Color codes click any value to copy
| Swatch | Name | HEX | RGB | HSL | OKLCH |
|---|---|---|---|---|---|
| Cobalt | #46399E | rgb(70, 57, 158) | hsl(248, 47%, 42%) | oklch(42.0% 0.157 283) | |
| Slate Blue | #5F68D3 | rgb(95, 104, 211) | hsl(235, 57%, 60%) | oklch(56.5% 0.162 276) | |
| Cornflower | #8CAAFC | rgb(140, 170, 252) | hsl(224, 95%, 77%) | oklch(74.9% 0.123 268) | |
| Frost | #E3F2FD | rgb(227, 242, 253) | hsl(205, 87%, 94%) | oklch(95.3% 0.022 239) |
Why it works and how to use it
The palette holds together thanks to its analogous hue relationship and a strong light-to-dark ladder (94% down to 42% lightness). A natural fit for websites, presentations and branding.
- Background: Frost (#E3F2FD) is the lightest color, so it belongs on large surfaces.
- Text: Cobalt (#46399E) on #E3F2FD gives 7.86:1, passing WCAG AAA.
- Primary: Cornflower (#8CAAFC) is the most saturated mid-tone; use it for buttons and links with a border or a darker shade for contrast.
- Accent: Slate Blue (#5F68D3) for highlights, badges and hover states.
1 of 6 color pairs pass WCAG AA (4.5:1); the strongest is Cobalt on Frost at 7.86:1.
Preview on a real UI see how the palette feels in context
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Design faster with Royal Slate Blue & Cobalt
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
#46399E
#5F68D3
#8CAAFC
#E3F2FD
Color-blind check: all four colors stay distinguishable under protanopia, deuteranopia and tritanopia.
Contrast check WCAG ratios between palette colors
| Pair | Sample | Ratio | Level |
|---|---|---|---|
#46399E on #E3F2FD | Aa | 7.86:1 | AAA |
#5F68D3 on #E3F2FD | Aa | 4.17:1 | AA large only |
#46399E on #8CAAFC | Aa | 3.96:1 | AA large only |
#5F68D3 on #8CAAFC | Aa | 2.1:1 | Fail |
#8CAAFC on #E3F2FD | Aa | 1.98:1 | Fail |
#46399E on #5F68D3 | Aa | 1.88:1 | Fail |
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