Color
#c31909
#c31909rgb(195, 25, 9)hsl(5, 91%, 40%)oklch(0.522 0.202 30.1)Colors that go with #c31909
Charcoal, Royal Blue and Sea Green 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 #c31909: 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 #c31909 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #c31909 — 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 #c31909: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Teal #008080
complementaryshippedTeal sits directly opposite #c31909 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 #c31909 in 6 real palettes, including Maple and Ember, as the accent.
Blue #0000ff
shipped5 real palettes, including Tim Hortons's brand system and native Cybersecurity's brand system put Blue beside #c31909, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #c31909: 4 real palettes, including Behance's brand system and MLB's brand system, as the supporting colour.
Real palettes that use #c31909
Tints & shades
Harmonies
Contrast
| #c31909 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.06:1 | pass | pass | fail |
|
Aaon black | 3.46:1 | 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 #c31909 as the background.
Brands using this color
Fonts for this mood
#c31909 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 #c31909 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/c31909-c4a49c-62cba1-2d261f-f1e9ec?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