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
#42b5cd
#42b5cd
hex
#42b5cdrgb
rgb(66, 181, 205)hsl
hsl(190, 58%, 53%)oklch
oklch(0.719 0.107 214.3)Closest name: Blue Bobbin (#52b4ca)Relative luminance 0.3861
Colors that go with #42b5cd
Charcoal, Blue 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 #42b5cd: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped4 real palettes, including Canva's brand system and Warp's brand system put Blue beside #42b5cd, as the accent.
Crimson #dc143c
shippedCrimson is paired with #42b5cd in 4 real palettes, including Riot Games's brand system and Diner, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #42b5cd: 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 #42b5cd: 5 real palettes, including Patreon's brand system and Figma's brand system, as the accent.
Midnight Blue #191970
shipped9 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #42b5cd, as the lead colour.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #42b5cd: 4 real palettes, including First Snow and Calendly's brand system, as the accent.
Salmon #fa8072
complementarySalmon sits directly opposite #42b5cd on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #42b5cd
Tints & shades
Harmonies
Contrast
| #42b5cd as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.41:1 | fail | fail | fail | |
Aaon black | 8.72:1 | 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 #42b5cd as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#42b5cd reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #42b5cd
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 #42b5cd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/42b5cd-a2b6be-df4e7c-1f252d-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