Color
#42d9ff
#42d9ffrgb(66, 217, 255)hsl(192, 100%, 63%)oklch(0.823 0.133 218.8)Colors that go with #42d9ff
Charcoal, Crimson and Dodger 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 #42d9ff: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with #42d9ff in 4 real palettes, including Riot Games's brand system and Tiffany & Co.'s brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #42d9ff: 5 real palettes, including Patreon's brand system and Opensea's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #42d9ff in 10 real palettes, including Boeing's brand system and Crayon Box, as the text colour against it.
Wheat #f5deb3
shippedDesigners have shipped Wheat with #42d9ff: 4 real palettes, including Oatly's brand system and Mint Chip, as the supporting colour.
Coral #ff7f50
complementaryCoral sits directly opposite #42d9ff on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Light Coral #f08080
split-complementshippedLight Coral is a split-complement of #42d9ff: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue #0000ff
shipped3 real palettes, including Warp's brand system and Uber's brand system put Blue beside #42d9ff, as the supporting colour.
Real palettes that use #42d9ff
Tints & shades
Harmonies
Contrast
| #42d9ff as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.67:1 | fail | fail | fail | |
Aaon black | 12.6:1 | 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 #42d9ff as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#42d9ff 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 #42d9ff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/42d9ff-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