Color
#66d3db
#66d3dbrgb(102, 211, 219)hsl(184, 62%, 63%)oklch(0.806 0.1 201.8)Colors that go with #66d3db
Charcoal, Dark Salmon 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 #66d3db: softer than #000 and cool enough to feel like part of the same palette.
Dark Salmon #e9967a
complementaryshippedDark Salmon sits directly opposite #66d3db on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Crimson #dc143c
shippedCrimson is paired with #66d3db in 4 real palettes, including Tiffany & Co.'s brand system and Riot Games's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #66d3db: 5 real palettes, including Patreon's brand system and Opensea's brand system, as the accent.
Midnight Blue #191970
shipped4 real palettes, including Telehealth and First Snow put Midnight Blue beside #66d3db, as the text colour against it.
Plum #dda0dd
split-complementshippedPlum is a split-complement of #66d3db: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
shippedRoyal Blue is paired with #66d3db in 4 real palettes, including Telehealth and 1password's brand system, as the lead colour.
Slate Gray #708090
shipped6 real palettes, including Still Water and Dusty Blue put Slate Gray beside #66d3db, as the lead colour.
Real palettes that use #66d3db
Tints & shades
Harmonies
Contrast
| #66d3db as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.76:1 | fail | fail | fail | |
Aaon black | 11.91:1 | 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 #66d3db as the background.
Brands using this color
Fonts for this mood
#66d3db reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #66d3db and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66d3db-a2b9be-df4e8a-1f262d-e9f1ee?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