Color
#6399b0
#6399b0rgb(99, 153, 176)hsl(198, 33%, 54%)oklch(0.654 0.067 226.8)Colors that go with #6399b0
Charcoal, Peru 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 #6399b0: softer than #000 and cool enough to feel like part of the same palette.
Peru #cd853f
complementaryshippedPeru sits directly opposite #6399b0 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #6399b0 in 4 real palettes, including Beach Hut and Wired's brand system, as the supporting colour.
Copper #b87333
shippedDesigners have shipped Copper with #6399b0: 6 real palettes, including Dusk and Atelier, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #6399b0: 7 real palettes, including Dusk and Open House, as the lead colour.
Midnight Blue #191970
shipped10 real palettes, including Ford's brand system and SoFi's brand system put Midnight Blue beside #6399b0, as the lead colour.
Orange #ffa500
shipped5 real palettes, including Gopro's brand system and Graphite put Orange beside #6399b0, as the accent.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #6399b0: 5 real palettes, including Ink Wash and First Snow, as the lead colour.
Real palettes that use #6399b0
Tints & shades
Harmonies
Contrast
| #6399b0 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.13:1 | fail | pass | fail | |
Aaon black | 6.71:1 | pass | 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 #6399b0 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 #6399b0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/6399b0-9cb3c4-df4e69-1f232d-e9f1f0?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