Color
#661bd0
#661bd0rgb(102, 27, 208)hsl(265, 77%, 46%)oklch(0.465 0.241 292.5)Colors that go with #661bd0
Charcoal, Olive Green and Denim 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 #661bd0: softer than #000 and cool enough to feel like part of the same palette.
Olive Green #808000
complementaryOlive Green sits directly opposite #661bd0 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Denim #1560bd
shippedDesigners have shipped Denim with #661bd0: 3 real palettes, including Linkedin's brand system and Slack's brand system, as the lead colour.
Royal Blue #4169e1
analogousshippedRoyal Blue is #661bd0's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
triadicshippedTeal completes a triad with #661bd0 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Tomato #ff6347
shipped3 real palettes, including GitLab's brand system and Etsy's brand system put Tomato beside #661bd0, as the lead colour.
Forest Green #228b22
split-complementForest Green is a split-complement of #661bd0: 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 #661bd0: two real palettes: Zillow's brand system and Unilever's brand system, as the supporting colour.
Real palettes that use #661bd0
Tints & shades
Harmonies
Contrast
| #661bd0 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.98:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.63:1 | 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 #661bd0 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
#661bd0 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 #661bd0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/661bd0-b19cc4-dfd54e-2b1f2d-e9eaf1?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