Color
#391188
#391188rgb(57, 17, 136)hsl(260, 78%, 30%)oklch(0.334 0.174 287.8)Colors that go with #391188
Royal Blue, Cobalt Blue and Crimson 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.
Royal Blue #4169e1
analogousshippedRoyal Blue is #391188's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #391188: 4 real palettes, including Tide's brand system and Purina Pro Plan's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #391188 in 4 real palettes, including Pepsi's brand system and Casper Sleep's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #391188: 4 real palettes, including Bank of America's brand system and Panasonic's brand system, as the accent.
Steel Blue #4682b4
shippedDesigners have shipped Steel Blue with #391188: 5 real palettes, including FedEx's brand system and Hershey's's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #391188 in 4 real palettes, including Boeing's brand system and Gillette's brand system, as that palette's text colour.
Olive Green #808000
complementaryOlive Green sits directly opposite #391188 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #391188: softer than #000 and cool enough to feel like part of the same palette.
Real palettes that use #391188
Tints & shades
Harmonies
Contrast
| #391188 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.05:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.61:1 | 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 #391188 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
#391188 reads as cool, vivid, dark. 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 #391188 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/391188-ae9cc4-dfc94e-2a1f2d-e9ebf1?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