Circuit
Open in tool →Violet plus cyan is the current AI-product signal — pair it with pure black type to keep it from going candy.
Color
#18b8cd
#18b8cd
hex
#18b8cdrgb
rgb(24, 184, 205)hsl
hsl(187, 79%, 45%)oklch
oklch(0.718 0.121 209.6)Closest name: Aquarius (#2db0ce)Relative luminance 0.3888
Colors that go with #18b8cd
Charcoal, Dark Orange and Denim 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 #18b8cd: softer than #000 and cool enough to feel like part of the same palette.
Dark Orange #ff8c00
split-complementshippedDark Orange is a split-complement of #18b8cd: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Denim #1560bd
shippedDesigners have shipped Denim with #18b8cd: 6 real palettes, including Coca-Cola's brand system and Venmo's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #18b8cd: 5 real palettes, including Patreon's brand system and Figma's brand system, as the accent.
Midnight Blue #191970
shipped8 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #18b8cd, as the lead colour.
Orange #ffa500
shipped4 real palettes, including Mistral AI's brand system and Gopro's brand system put Orange beside #18b8cd, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #18b8cd in 7 real palettes, including Confluent's brand system and Elastic's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #18b8cd in 8 real palettes, including Cursor's brand system and Crayon Box, as the text colour against it.
Real palettes that use #18b8cd
Tints & shades
Harmonies
Contrast
| #18b8cd as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.39:1 | fail | fail | fail | |
Aaon black | 8.78:1 | 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 #18b8cd as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#18b8cd reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #18b8cd
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 #18b8cd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/18b8cd-a2b8be-df4e83-1f262d-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