Color
#c90306
#c90306rgb(201, 3, 6)hsl(359, 97%, 40%)oklch(0.526 0.214 28.8)Colors that go with #c90306
Charcoal, Royal Blue and Steel 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 body-text near-black for #c90306: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Royal Blue #4169e1
triadicshippedRoyal Blue completes a triad with #c90306 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
split-complementshippedSteel Blue is a split-complement of #c90306: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Teal #008080
complementaryshippedTeal sits directly opposite #c90306 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 #c90306 in 6 real palettes, including Maple and McDonald's's brand system, as the accent.
Blue #0000ff
shipped5 real palettes, including Tim Hortons's brand system and native Cybersecurity's brand system put Blue beside #c90306, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #c90306: 4 real palettes, including Behance's brand system and MLB's brand system, as the supporting colour.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #c90306 in 4 real palettes, including Farmers Market and Olive Grove, as the supporting colour.
Real palettes that use #c90306
Tints & shades
Harmonies
Contrast
| #c90306 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6:1 | pass | pass | fail |
|
Aaon black | 3.5:1 | 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 #c90306 as the background.
Brands using this color
Fonts for this mood
#c90306 reads as warm, vivid, playful. 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 #c90306 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/c90306-c4a09c-62cb96-2d251f-f1e9ed?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