Color
#311bc0
#311bc0rgb(49, 27, 192)hsl(248, 75%, 43%)oklch(0.4 0.231 274.3)Colors that go with #311bc0
Charcoal, Blue and Cornflower 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 #311bc0: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped4 real palettes, including Pfizer's brand system and Procter & Gamble's brand system put Blue beside #311bc0, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #311bc0: 6 real palettes, including Blue Mono and Qualcomm's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #311bc0: 6 real palettes, including Google's brand system and Intel's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #311bc0: 6 real palettes, including Absolut's brand system and Cargo's brand system, as the supporting colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #311bc0 in 4 real palettes, including Spotify's brand system and Fintech Trust, as the lead colour.
Midnight Blue #191970
shipped7 real palettes, including Blue Mono and Purina Pro Plan's brand system put Midnight Blue beside #311bc0, as that palette's text colour.
Steel Blue #4682b4
analogousshippedSteel Blue is #311bc0's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Real palettes that use #311bc0
Tints & shades
Harmonies
Contrast
| #311bc0 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.25:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.05:1 | 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 #311bc0 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
#311bc0 reads as cool, vivid, technical. 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 #311bc0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/311bc0-a69cc4-dfac4e-271f2d-e9ecf1?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