Coastal
Open in tool →Sea-teal, sky and sand — bright without shouting; works for travel, wellness, and anything near water.
Color
#21978b
#21978b
hex
#21978brgb
rgb(33, 151, 139)hsl
hsl(174, 64%, 36%)oklch
oklch(0.612 0.1 184.5)Closest name: Green Dynasty (#00988e)Relative luminance 0.2432
Colors that go with #21978b
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 #21978b: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
triadicshippedCopper completes a triad with #21978b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Crimson #dc143c
shippedCrimson is paired with #21978b in 9 real palettes, including Diner and Redfin's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21978b: 7 real palettes, including Peacock and Intel's brand system, as the supporting colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #21978b in 4 real palettes, including Noir Beauty and Ledger Dark, as the lead colour.
Midnight Blue #191970
shipped7 real palettes, including Tide Pool and Ford's brand system put Midnight Blue beside #21978b, as that palette's text colour.
Orange #ffa500
shipped4 real palettes, including Olympics's brand system and Mint Modern put Orange beside #21978b, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21978b in 8 real palettes, including Subaru's brand system and Coinbase's brand system, as the supporting colour.
Tints & shades
Harmonies
Contrast
| #21978b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.58:1 | fail | pass | fail | |
Aaon black | 5.86:1 | 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 #21978b 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
Diner
Open in tool →Cherry red, mint-teal and butter yellow — chrome-and-vinyl retro; the red does the work, the teal cools it.
Tide Pool
Open in tool →Sea-green and slate with a coral — a literal tide pool: two cool tones, one warm creature.
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.
mcpConnect your agent — build around #21978b
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 #21978b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21978b-a2bebe-d459a1-1f292d-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