Color
#d21e42
#d21e42rgb(210, 30, 66)hsl(348, 75%, 47%)oklch(0.558 0.209 18.2)Colors that go with #d21e42
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 #d21e42: 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 #d21e42 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #d21e42: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Steel Blue #4682b4
split-complementshippedSteel Blue is a split-complement of #d21e42: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Teal #008080
complementaryshippedTeal sits directly opposite #d21e42 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 #d21e42 in 6 real palettes, including Maple and McDonald's's brand system, as the accent.
Blue #0000ff
shipped6 real palettes, including Tim Hortons's brand system and Dunkin''s brand system put Blue beside #d21e42, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #d21e42: 4 real palettes, including Walgreens's brand system and MLB's brand system, as the accent.
Real palettes that use #d21e42
Tints & shades
Harmonies
Contrast
| #d21e42 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.24:1 | pass | pass | fail |
|
Aaon black | 4:1 | 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 #d21e42 as the background.
Brands using this color
Fonts for this mood
#d21e42 reads as warm, vivid, playful. 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 #d21e42 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/d21e42-c49c9f-62cb83-2d231f-f1e9ef?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