Lagoon
Open in tool →Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef.
Color
#15bca3
#15bca3
hex
#15bca3rgb
rgb(21, 188, 163)hsl
hsl(171, 80%, 41%)oklch
oklch(0.713 0.128 178.4)Closest name: Emerald Bliss (#4cbdac)Relative luminance 0.3877
Colors that go with #15bca3
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 #15bca3: softer than #000 and cool enough to feel like part of the same palette.
Hot Pink #ff69b4
complementaryshippedHot Pink sits directly opposite #15bca3 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 #15bca3, as the supporting colour.
Midnight Blue #191970
shipped5 real palettes, including Fintech Trust and Ford's brand system put Midnight Blue beside #15bca3, as the text colour against it.
Mustard Yellow #ffdb58
shipped5 real palettes, including Crayon Box and Fresh Juice put Mustard Yellow beside #15bca3, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #15bca3 in 4 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #15bca3 in 15 real palettes, including Crayon Box and Resort, as the text colour against it.
Burlywood #deb887
shippedBurlywood is paired with #15bca3 in 3 real palettes, including Coastal and Polaroid, as the accent.
Real palettes that use #15bca3
Tints & shades
Harmonies
Contrast
| #15bca3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.4:1 | fail | fail | fail | |
Aaon black | 8.75:1 | 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 #15bca3 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 #15bca3
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 #15bca3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/15bca3-a2bebd-d459a7-1f292d-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