Color
#3f090f
#3f090frgb(63, 9, 15)hsl(353, 75%, 14%)oklch(0.244 0.082 20)Colors that go with #3f090f
Charcoal, Royal Blue and Sienna 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 #3f090f: 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 #3f090f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
analogousshippedSienna is #3f090f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Steel Blue #4682b4
split-complementshippedSteel Blue is a split-complement of #3f090f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Teal #008080
complementaryshippedTeal sits directly opposite #3f090f 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 #3f090f in 17 real palettes, including Maple and Heatwave, as the accent.
Blue #0000ff
shipped19 real palettes, including Tim Hortons's brand system and Headspace's brand system put Blue beside #3f090f, as the accent.
Blue Violet #8a2be2
shippedBlue Violet is paired with #3f090f in 9 real palettes, including ClickUp's brand system and Yahoo's brand system, as the lead colour.
Real palettes that use #3f090f
Tints & shades
Harmonies
Contrast
| #3f090f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 16.7:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.26:1 | 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 #3f090f as the background.
Brands using this color
Fonts for this mood
#3f090f 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 #3f090f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f090f-c49c9c-62cb8c-2d241f-f1e9ee?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