Coastal
Open in tool →Sea-teal, sky and sand — bright without shouting; works for travel, wellness, and anything near water.
Color
#399d84
#399d84
hex
#399d84rgb
rgb(57, 157, 132)hsl
hsl(165, 47%, 42%)oklch
oklch(0.631 0.1 173.4)Closest name: Green Dynasty (#00988e)Relative luminance 0.2665
Colors that go with #399d84
Charcoal, Chocolate and Copper 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 #399d84: softer than #000 and cool enough to feel like part of the same palette.
Chocolate #d2691e
triadicshippedChocolate completes a triad with #399d84 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Copper #b87333
shippedDesigners have shipped Copper with #399d84: 5 real palettes, including Clean Beauty and Wellness, as the accent.
Crimson #dc143c
shippedCrimson is paired with #399d84 in 6 real palettes, including Diner and DuckDuckGo's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #399d84: 5 real palettes, including Peacock and Intel's brand system, as the supporting colour.
Midnight Blue #191970
shipped7 real palettes, including Tide Pool and Fintech Trust put Midnight Blue beside #399d84, as that palette's text colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #399d84 in 7 real palettes, including Khan Academy's brand system and Subaru's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #399d84 in 16 real palettes, including Rain Garden and Clean Beauty, as that palette's text colour.
Tints & shades
Harmonies
Contrast
| #399d84 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.32:1 | fail | pass | fail | |
Aaon black | 6.33:1 | 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 #399d84 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 #399d84
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 #399d84 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/399d84-a2beba-d459b3-1f2b2d-e9f1eb?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