Color
#660fb3
#660fb3rgb(102, 15, 179)hsl(272, 85%, 38%)oklch(0.43 0.22 299.7)Colors that go with #660fb3
Olive Green, Charcoal and Tomato 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.
Olive Green #808000
complementaryOlive Green sits directly opposite #660fb3 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 #660fb3: softer than #000 and cool enough to feel like part of the same palette.
Tomato #ff6347
shipped3 real palettes, including FedEx's brand system and dbt Labs's brand system put Tomato beside #660fb3, as the supporting colour.
Teal #008080
triadicshippedTeal completes a triad with #660fb3 — 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 #660fb3: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue Violet #8a2be2
shippedBlue Violet is paired with #660fb3 in two real palettes: Twitch's brand system and Taco Bell's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #660fb3 in two real palettes: Gemstone and Wells Fargo's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #660fb3: two real palettes: Slack's brand system and Linkedin's brand system, as the lead colour.
Real palettes that use #660fb3
Tints & shades
Harmonies
Contrast
| #660fb3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.19:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.28:1 | 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 #660fb3 as the background.
Brands using this color
Fonts for this mood
#660fb3 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 #660fb3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/660fb3-b69cc4-c5cb62-2d1f2d-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