Gallery
Open in tool →Near-monochrome with one burnt-orange highlight — an art director's default because it never competes with the work.
Color
#cb3b0b
#cb3b0b
hex
#cb3b0brgb
rgb(203, 59, 11)hsl
hsl(15, 90%, 42%)oklch
oklch(0.562 0.188 35.9)Closest name: Bolognese (#bb4400)Relative luminance 0.1585
Colors that go with #cb3b0b
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 #cb3b0b: 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 #cb3b0b — 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 #cb3b0b — 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 #cb3b0b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #cb3b0b in 7 real palettes, including Trailhead and McDonald's's brand system, as the accent.
Blue #0000ff
shipped8 real palettes, including Tim Hortons's brand system and Doordash's brand system put Blue beside #cb3b0b, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #cb3b0b: 5 real palettes, including Behance's brand system and Walgreens's brand system, as the supporting colour.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #cb3b0b in 5 real palettes, including Farmers Market and Magazine Ochre, as the supporting colour.
Real palettes that use #cb3b0b
Tints & shades
Harmonies
Contrast
| #cb3b0b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.04:1 | pass | pass | fail |
|
Aaon black | 4.17:1 | 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 #cb3b0b as the background.
Brands using this color
Palettes built around it
Trailhead
Open in tool →Rust, pine and sun — high-visibility earth tones that read at a distance and on a trail sign.
Garnet
Open in tool →Garnet, carnelian and citrine on a wine-black — the warm jewel set for spirits, theatre and jewellery itself.
Fonts for this mood
#cb3b0b reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #cb3b0b
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #cb3b0b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/cb3b0b-c4ab9c-62cbb2-2d291f-f1e9eb?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