Color
#40378b
#40378brgb(64, 55, 139)hsl(246, 43%, 38%)oklch(0.396 0.134 283.2)Colors that go with #40378b
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 #40378b: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #40378b'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 #40378b, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #40378b in 11 real palettes, including Walgreens's brand system and Wells Fargo's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #40378b: 14 real palettes, including Warbyparker's brand system and Unilever's brand system, as the accent.
Midnight Blue #191970
shipped15 real palettes, including Fintech Trust and First Snow put Midnight Blue beside #40378b, as that palette's text colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #40378b in 11 real palettes, including Nokia's brand system and Nivea's brand system, as the supporting colour.
Tomato #ff6347
shipped6 real palettes, including dbt Labs's brand system and FedEx's brand system put Tomato beside #40378b, as the lead colour.
Real palettes that use #40378b
Tints & shades
Harmonies
Contrast
| #40378b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.83:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.14:1 | 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 #40378b 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
#40378b 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 #40378b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/40378b-a59cc4-dfa74e-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