Lagoon
Open in tool →Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef.
Color
#18b99e
#18b99e
hex
#18b99ergb
rgb(24, 185, 158)hsl
hsl(170, 77%, 41%)oklch
oklch(0.704 0.127 176.9)Closest name: Electra (#55b492)Relative luminance 0.3736
Colors that go with #18b99e
Charcoal, Hot Pink and 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 #18b99e: softer than #000 and cool enough to feel like part of the same palette.
Hot Pink #ff69b4
complementaryshippedHot Pink sits directly opposite #18b99e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped4 real palettes, including Unity's brand system and Canva's brand system put Blue beside #18b99e, as the supporting colour.
Midnight Blue #191970
shipped6 real palettes, including Fintech Trust and Ford's brand system put Midnight Blue beside #18b99e, as the text colour against it.
Mustard Yellow #ffdb58
shipped5 real palettes, including Crayon Box and Diner put Mustard Yellow beside #18b99e, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #18b99e in 6 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #18b99e in 13 real palettes, including Resort and Chime's brand system, as the text colour against it.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #18b99e: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #18b99e
Tints & shades
Harmonies
Contrast
| #18b99e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.48:1 | fail | fail | fail | |
Aaon black | 8.47:1 | 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 #18b99e as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #18b99e
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 #18b99e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/18b99e-a2bebd-d459a9-1f292d-e9f1ec?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