Color
#271d81
#271d81rgb(39, 29, 129)hsl(246, 63%, 31%)oklch(0.323 0.158 277.3)Colors that go with #271d81
Steel Blue, Olive Green 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #271d81's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Olive Green #808000
complementaryOlive Green sits directly opposite #271d81 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shippedBlue is paired with #271d81 in 3 real palettes, including Pepsi's brand system and Procter & Gamble's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #271d81: softer than #000 and cool enough to feel like part of the same palette.
Sienna #a0522d
split-complementSienna is a split-complement of #271d81: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Dark Orchid #9932cc
analogousshippedDark Orchid is #271d81's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Cobalt Blue #0047ab
shippedCobalt Blue is paired with #271d81 in two real palettes: Tide's brand system and Blue Mono, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Cornflower Blue #6495ed
shippedCornflower Blue is paired with #271d81 in two real palettes: Peacock's brand system and Blue Mono, as the accent — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #271d81
Tints & shades
Harmonies
Contrast
| #271d81 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.3:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.58:1 | 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 #271d81 as the background.
Brands using this color
Fonts for this mood
#271d81 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 #271d81 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/271d81-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