Color
#21811d
#21811drgb(33, 129, 29)hsl(118, 63%, 31%)oklch(0.529 0.16 142.4)Colors that go with #21811d
Charcoal, Crimson and Royal Blue 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 #21811d: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Crimson #dc143c
triadicshippedCrimson completes a triad with #21811d — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Royal Blue #4169e1
triadicshippedRoyal Blue completes a triad with #21811d — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Blue #0000ff
shipped4 real palettes, including Instacart's brand system and Kia's brand system put Blue beside #21811d, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #21811d: 5 real palettes, including Xbox's brand system and Intel's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #21811d in 9 real palettes, including Acer's brand system and Instacart's brand system, as that palette's text colour.
Dark Orchid #9932cc
complementaryDark Orchid sits directly opposite #21811d on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Medium Violet Red #c71585
split-complementshippedMedium Violet Red is a split-complement of #21811d: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #21811d
Tints & shades
Harmonies
Contrast
| #21811d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.97:1 | pass | pass | fail |
|
Aaon black | 4.22:1 | 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 #21811d as the background.
Brands using this color
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 #21811d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21811d-a2bea4-944edf-1f2d25-edf1e9?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