Color
#21031c
#21031crgb(33, 3, 28)hsl(310, 83%, 7%)oklch(0.177 0.067 335.1)Colors that go with #21031c
Blue Violet, Charcoal 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.
Blue Violet #8a2be2
analogousshippedBlue Violet is #21031c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #21031c: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Sea Green #2e8b57
complementaryshippedSea Green sits directly opposite #21031c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Teal #008080
split-complementshippedTeal is a split-complement of #21031c: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #21031c in 16 real palettes, including Lemon Squeezy's brand system and Southwest Airlines's brand system, as the lead colour.
Blue #0000ff
shipped20 real palettes, including Warp's brand system and native Cybersecurity's brand system put Blue beside #21031c, as the supporting colour.
Brown #a52a2a
shipped4 real palettes, including Garnet and Velvet put Brown beside #21031c, as the lead colour.
Burgundy #800020
shipped4 real palettes, including Mailchimp's brand system and Qatar Airways's brand system put Burgundy beside #21031c, as the accent.
Real palettes that use #21031c
Tints & shades
Harmonies
Contrast
| #21031c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 19.19:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.09:1 | 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 #21031c 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
#21031c 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 #21031c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21031c-c19fb7-83cb62-2d1f25-efe9f1?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