Color
#663cd3
#663cd3rgb(102, 60, 211)hsl(257, 63%, 53%)oklch(0.499 0.216 288.8)Colors that go with #663cd3
Charcoal, Royal Blue and Amber 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 #663cd3: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #663cd3's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with #663cd3 in 5 real palettes, including Warner Bros.'s brand system and Mastodon hosted on mastodon.social's brand system, as the accent.
Blue #0000ff
shipped4 real palettes, including Zillow's brand system and Signal's brand system put Blue beside #663cd3, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #663cd3: 7 real palettes, including Coca-Cola's brand system and Mastodon hosted on mastodon.social's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #663cd3 in 6 real palettes, including Gemstone and Netflix's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #663cd3: 4 real palettes, including Coursera's brand system and HashiCorp's brand system, as the supporting colour.
Light Sky Blue #87cefa
shippedLight Sky Blue is paired with #663cd3 in 4 real palettes, including Calm's brand system and Sentry's brand system, as the supporting colour.
Real palettes that use #663cd3
Tints & shades
Harmonies
Contrast
| #663cd3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.66:1 | pass | pass | fail |
|
Aaon black | 3.15:1 | 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 #663cd3 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
#663cd3 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 #663cd3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/663cd3-ac9cc4-dfc24e-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