Color
#6541b9
#6541b9rgb(101, 65, 185)hsl(258, 48%, 49%)oklch(0.484 0.18 292.1)Colors that go with #6541b9
Charcoal, Royal Blue and Sea Green 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 #6541b9: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #6541b9's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #6541b9: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #6541b9: 4 real palettes, including Zillow's brand system and Warbyparker's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #6541b9 in 11 real palettes, including Wells Fargo's brand system and Gemstone, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #6541b9: 10 real palettes, including Linkedin's brand system and Slack's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #6541b9: 4 real palettes, including Datadog's brand system and Campbell's's brand system, as the accent.
Midnight Blue #191970
shipped12 real palettes, including Kraken's brand system and Paramount+'s brand system put Midnight Blue beside #6541b9, as the lead colour.
Real palettes that use #6541b9
Tints & shades
Harmonies
Contrast
| #6541b9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.98:1 | pass | pass | fail |
|
Aaon black | 3.01:1 | fail | pass | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #6541b9 as the background.
Brands using this color
Fonts for this mood
#6541b9 reads as cool, modern. 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 #6541b9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/6541b9-ad9cc4-dfc44e-291f2d-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