Color
#42818f
#42818frgb(66, 129, 143)hsl(191, 37%, 41%)oklch(0.567 0.068 214)Colors that go with #42818f
Charcoal, Copper and Rust 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 #42818f: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
split-complementshippedCopper is a split-complement of #42818f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Rust #b7410e
complementaryshippedRust sits directly opposite #42818f on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #42818f: 6 real palettes, including Ink & Paper and Fintech Trust, as the accent.
Crimson #dc143c
shippedCrimson is paired with #42818f in 10 real palettes, including Redfin's brand system and Retro Pop, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #42818f: 13 real palettes, including Campus and Discover's brand system, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #42818f in 5 real palettes, including Sapphire & Gold and Mid-Century, as the supporting colour.
Midnight Blue #191970
shipped9 real palettes, including Discover's brand system and Tide Pool put Midnight Blue beside #42818f, as the lead colour.
Real palettes that use #42818f
Tints & shades
Harmonies
Contrast
| #42818f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.4:1 | fail | pass | fail | |
Aaon black | 4.77:1 | 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 #42818f 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
#42818f reads as cool, modern. 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 #42818f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/42818f-a2b6be-df4e7a-1f252d-e9f1ef?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