Color
#6366a1
#6366a1rgb(99, 102, 161)hsl(237, 25%, 51%)oklch(0.533 0.092 280.6)Colors that go with #6366a1
Charcoal, Amber and Blue 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 #6366a1: softer than #000 and cool enough to feel like part of the same palette.
Amber #ffbf00
shippedAmber is paired with #6366a1 in 8 real palettes, including Warner Bros.'s brand system and McDonald's's brand system, as the accent.
Blue #0000ff
shipped4 real palettes, including Pixar's brand system and Activision's brand system put Blue beside #6366a1, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #6366a1: 7 real palettes, including Fintech Trust and Glacier, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #6366a1 in 16 real palettes, including Marvel's brand system and Retro Pop, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #6366a1: 5 real palettes, including Astro's brand system and Venmo's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #6366a1: 4 real palettes, including Venmo's brand system and Apple's brand system, as the lead colour.
Dark Olive Green #556b2f
complementaryDark Olive Green sits directly opposite #6366a1 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #6366a1
Tints & shades
Harmonies
Contrast
| #6366a1 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.32:1 | pass | pass | fail |
|
Aaon black | 3.95:1 | 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 #6366a1 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #6366a1 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/6366a1-9f9cc4-df924e-251f2d-e9edf1?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