Crayon Box
Open in tool →Red, teal and yellow at crayon saturation — joyful, but on white with black type so it stays readable for grown-ups.
Color
#42cdca
#42cdca
hex
#42cdcargb
rgb(66, 205, 202)hsl
hsl(179, 58%, 53%)oklch
oklch(0.775 0.116 192.9)Closest name: mediumturquoise (#48d1cc)Relative luminance 0.4909
Colors that go with #42cdca
Charcoal, Light Coral and 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 #42cdca: softer than #000 and cool enough to feel like part of the same palette.
Light Coral #f08080
complementaryshippedLight Coral sits directly opposite #42cdca on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped4 real palettes, including Canva's brand system and Uber's brand system put Blue beside #42cdca, as the accent.
Crimson #dc143c
shippedCrimson is paired with #42cdca 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 #42cdca: 5 real palettes, including Patreon's brand system and Opensea's brand system, as the accent.
Midnight Blue #191970
shipped4 real palettes, including Confluent's brand system and Telehealth put Midnight Blue beside #42cdca, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #42cdca in 6 real palettes, including Docker's brand system and Khan Academy's brand system, as the supporting colour.
Slate Gray #708090
shipped5 real palettes, including Ledger Dark and Still Water put Slate Gray beside #42cdca, as the supporting colour.
Real palettes that use #42cdca
Tints & shades
Harmonies
Contrast
| #42cdca as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.94:1 | fail | fail | fail | |
Aaon black | 10.82:1 | 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 #42cdca as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
mcpConnect your agent — build around #42cdca
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 #42cdca and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/42cdca-a2bbbe-d45996-1f272d-e9f1ed?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