Color
#371ce9
#371ce9rgb(55, 28, 233)hsl(248, 82%, 51%)oklch(0.453 0.273 272.7)Colors that go with #371ce9
Charcoal, Cobalt 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 #371ce9: softer than #000 and cool enough to feel like part of the same palette.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #371ce9: 10 real palettes, including CVS's brand system and Procter & Gamble's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #371ce9: 6 real palettes, including Qualcomm's brand system and Canva's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #371ce9 in 6 real palettes, including Dunkin''s brand system and Tim Hortons's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #371ce9: 6 real palettes, including Pixar's brand system and Activision's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #371ce9: 7 real palettes, including Cargo's brand system and Readymag's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #371ce9: 4 real palettes, including 3M's brand system and MLB's brand system, as the supporting colour.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #371ce9 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #371ce9
Tints & shades
Harmonies
Contrast
| #371ce9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.38:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.51:1 | 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 #371ce9 as the background.
Brands using this color
Fonts for this mood
#371ce9 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 #371ce9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/371ce9-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