Color
#540303
#540303rgb(84, 3, 3)hsl(0, 93%, 17%)oklch(0.283 0.112 28.4)Colors that go with #540303
Royal Blue, Sienna and Teal 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.
Royal Blue #4169e1
triadicshippedRoyal Blue completes a triad with #540303 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
analogousshippedSienna is #540303's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
complementaryshippedTeal sits directly opposite #540303 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 #540303 in 5 real palettes, including Maple and McDonald's's brand system, as the accent.
Blue #0000ff
shipped8 real palettes, including Tim Hortons's brand system and Headspace's brand system put Blue beside #540303, as the accent.
Champagne #f7e7ce
shipped5 real palettes, including Darkroom and Woodsmoke put Champagne beside #540303, as the surface under it.
Chocolate #d2691e
shippedChocolate shows up next to #540303 in 4 real palettes, including Farmers Market and Wellness, as the lead colour.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #540303: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Real palettes that use #540303
Tints & shades
Harmonies
Contrast
| #540303 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.09:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.39:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #540303 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
#540303 reads as warm, vivid, dark. 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 #540303 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/540303-c4a19c-62cb98-2d251f-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