Color
#540a99
#540a99rgb(84, 10, 153)hsl(271, 88%, 32%)oklch(0.379 0.196 298.5)Colors that go with #540a99
Royal Blue, Olive Green and Teal 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 #540a99'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 #540a99 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Teal #008080
triadicshippedTeal completes a triad with #540a99 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sea Green #2e8b57
split-complementSea Green is a split-complement of #540a99: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue Violet #8a2be2
shippedBlue Violet is paired with #540a99 in two real palettes: Taco Bell's brand system and Twitch's brand system, as the supporting colour.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #540a99: softer than #000 and cool enough to feel like part of the same palette.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #540a99: two real palettes: Peacock's brand system and Blue Mono, as the accent.
Midnight Blue #191970
shippedTwo real palettes: Kraken's brand system and Blue Mono put Midnight Blue beside #540a99, as the lead colour.
Real palettes that use #540a99
Tints & shades
Harmonies
Contrast
| #540a99 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.17:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.88:1 | 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 #540a99 as the background.
Brands using this color
Fonts for this mood
#540a99 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 #540a99 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/540a99-b59cc4-c7cb62-2c1f2d-eae9f1?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