Color
#371ea9
#371ea9rgb(55, 30, 169)hsl(251, 70%, 39%)oklch(0.381 0.202 279.1)Colors that go with #371ea9
Charcoal, Blue and Midnight 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 #371ea9: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shippedBlue is paired with #371ea9 in 5 real palettes, including Procter & Gamble's brand system and Pepsi's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Midnight Blue #191970
shippedMidnight Blue is paired with #371ea9 in 7 real palettes, including Blue Mono and Fintech Trust, as the text colour against it — a combination designers have actually shipped, not a computed rotation.
Royal Blue #4169e1
shippedRoyal Blue is paired with #371ea9 in 6 real palettes, including Nivea's brand system and NHL's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Steel Blue #4682b4
analogousshippedSteel Blue is #371ea9'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 #371ea9 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cornflower Blue #6495ed
shippedCornflower Blue is paired with #371ea9 in 3 real palettes, including Peacock's brand system and Blue Mono, as the accent — a combination designers have actually shipped, not a computed rotation.
Crimson #dc143c
shippedCrimson is paired with #371ea9 in 3 real palettes, including Behance's brand system and Casper Sleep's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #371ea9
Tints & shades
Harmonies
Contrast
| #371ea9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.93:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.92:1 | 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 #371ea9 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
#371ea9 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 #371ea9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/371ea9-a89cc4-dfb34e-281f2d-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