Peacock
Open in tool →Teal, cobalt and magenta at full chroma on white — jewel tones in daylight; the trick is a near-black text with a blue cast.
Color
#21918e
#21918e
hex
#21918ergb
rgb(33, 145, 142)hsl
hsl(178, 63%, 35%)oklch
oklch(0.597 0.095 192.2)Closest name: Green Dynasty (#00988e)Relative luminance 0.2253
Colors that go with #21918e
Charcoal, Copper and Crimson 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 text near-black for #21918e: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
triadicshippedCopper completes a triad with #21918e — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Crimson #dc143c
complementaryshippedCrimson sits directly opposite #21918e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #21918e: 5 real palettes, including Intel's brand system and Fintech Trust, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21918e: 11 real palettes, including Peacock and Intel's brand system, as the supporting colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #21918e in 4 real palettes, including Sapphire & Gold and Ledger Dark, as the supporting colour.
Midnight Blue #191970
shipped8 real palettes, including Tide Pool and Ford's brand system put Midnight Blue beside #21918e, as that palette's text colour.
Orange #ffa500
shipped4 real palettes, including Campus and Graphite put Orange beside #21918e, as the accent.
Real palettes that use #21918e
Tints & shades
Harmonies
Contrast
| #21918e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.81:1 | fail | pass | fail | |
Aaon black | 5.51:1 | pass | 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 #21918e as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
mcpConnect your agent — build around #21918e
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 #21918e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21918e-a2bcbe-d45999-1f282d-e9f1ed?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