Color
#66d0ea
#66d0eargb(102, 208, 234)hsl(192, 76%, 66%)oklch(0.804 0.104 216.1)Colors that go with #66d0ea
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 #66d0ea: softer than #000 and cool enough to feel like part of the same palette.
Dark Salmon #e9967a
complementaryshippedDark Salmon sits directly opposite #66d0ea 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 #66d0ea in 5 real palettes, including Tiffany & Co.'s brand system and Riot Games's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #66d0ea: 4 real palettes, including UEFA's brand system and Venmo's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #66d0ea: 4 real palettes, including Patreon's brand system and Opensea's brand system, as the accent.
Midnight Blue #191970
shipped5 real palettes, including Telehealth and Blue Mono put Midnight Blue beside #66d0ea, as the text colour against it.
Royal Blue #4169e1
shippedRoyal Blue is paired with #66d0ea in 4 real palettes, including Telehealth and 1password's brand system, as the lead colour.
Slate Gray #708090
shipped4 real palettes, including Still Water and Dusty Blue put Slate Gray beside #66d0ea, as the lead colour.
Real palettes that use #66d0ea
Tints & shades
Harmonies
Contrast
| #66d0ea as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.78:1 | fail | fail | fail | |
Aaon black | 11.78:1 | 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 #66d0ea as the background.
Brands using this color
Fonts for this mood
#66d0ea 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 #66d0ea and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66d0ea-a2b5be-df4e77-1f242d-e9f1ef?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