Color
#31318c
#31318crgb(49, 49, 140)hsl(240, 48%, 37%)oklch(0.374 0.147 276.6)Colors that go with #31318c
Charcoal, Steel Blue and Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #31318c: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #31318c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped5 real palettes, including Procter & Gamble's brand system and CVS's brand system put Blue beside #31318c, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #31318c in 10 real palettes, including Casper Sleep's brand system and Walgreens's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #31318c: 12 real palettes, including Warbyparker's brand system and Unilever's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #31318c: 4 real palettes, including Nintendo's brand system and Datadog's brand system, as the accent.
Red #ff0000
shippedRed is paired with #31318c in 4 real palettes, including Walgreens's brand system and Hyundai's brand system, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #31318c in 10 real palettes, including Nokia's brand system and Nivea's brand system, as the supporting colour.
Real palettes that use #31318c
Tints & shades
Harmonies
Contrast
| #31318c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.78:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.95:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #31318c as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#31318c reads as cool, modern. The font library is tagged with the same vocabulary:
Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #31318c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/31318c-a19cc4-df994e-251f2d-e9edf1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md