Lagoon
Open in tool →Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef.
Color
#18b4ae
#18b4ae
hex
#18b4aergb
rgb(24, 180, 174)hsl
hsl(178, 76%, 40%)oklch
oklch(0.697 0.117 190.5)Closest name: lightseagreen (#20b2aa)Relative luminance 0.3589
Colors that go with #18b4ae
Charcoal, Denim and Midnight 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 text near-black for #18b4ae: softer than #000 and cool enough to feel like part of the same palette.
Denim #1560bd
shippedDesigners have shipped Denim with #18b4ae: 5 real palettes, including Peacock and Open House, as the supporting colour.
Midnight Blue #191970
shipped7 real palettes, including Ford's brand system and Confluent's brand system put Midnight Blue beside #18b4ae, as the lead colour.
Mustard Yellow #ffdb58
shipped4 real palettes, including Lido and Diner put Mustard Yellow beside #18b4ae, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #18b4ae in 4 real palettes, including Cursor's brand system and Launch Orange, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #18b4ae in 5 real palettes, including Khan Academy's brand system and Confluent's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #18b4ae in 13 real palettes, including Resort and Crayon Box, as the text colour against it.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #18b4ae: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #18b4ae
Tints & shades
Harmonies
Contrast
| #18b4ae as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.57:1 | fail | fail | fail | |
Aaon black | 8.18:1 | pass | pass | pass | Passes AAA — no fix needed. |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #18b4ae 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 #18b4ae
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 #18b4ae and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/18b4ae-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