Color
#331e99
#331e99rgb(51, 30, 153)hsl(250, 67%, 36%)oklch(0.36 0.184 279.6)Colors that go with #331e99
Steel Blue, 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #331e99'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 Pepsi's brand system and Procter & Gamble's brand system put Blue beside #331e99, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #331e99 in 4 real palettes, including Casper Sleep's brand system and Nintendo's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #331e99: 4 real palettes, including Google's brand system and Bank of America's brand system, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #331e99 in 6 real palettes, including Discord's brand system and Nivea's brand system, as the lead colour.
Olive Green #808000
complementaryOlive Green sits directly opposite #331e99 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 #331e99: softer than #000 and cool enough to feel like part of the same palette.
Taupe #483c32
shippedTaupe is paired with #331e99 in 3 real palettes, including Boeing's brand system and Gillette's brand system, as that palette's text colour.
Real palettes that use #331e99
Tints & shades
Harmonies
Contrast
| #331e99 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.76:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.79:1 | 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 #331e99 as the background.
Brands using this color
Fonts for this mood
#331e99 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 #331e99 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/331e99-a79cc4-dfb14e-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