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
#3dcfd1
#3dcfd1
hex
#3dcfd1rgb
rgb(61, 207, 209)hsl
hsl(181, 62%, 53%)oklch
oklch(0.781 0.119 196.4)Closest name: mediumturquoise (#48d1cc)Relative luminance 0.5022
Colors that go with #3dcfd1
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 #3dcfd1: softer than #000 and cool enough to feel like part of the same palette.
Light Coral #f08080
complementaryshippedLight Coral sits directly opposite #3dcfd1 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 #3dcfd1, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3dcfd1 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 #3dcfd1: 5 real palettes, including Patreon's brand system and Opensea's brand system, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #3dcfd1 in 6 real palettes, including Docker's brand system and Khan Academy's brand system, as the supporting colour.
Slate Gray #708090
shipped4 real palettes, including Ledger Dark and Still Water put Slate Gray beside #3dcfd1, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #3dcfd1 in 14 real palettes, including Crayon Box and Boeing's brand system, as the text colour against it.
Real palettes that use #3dcfd1
Tints & shades
Harmonies
Contrast
| #3dcfd1 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.9:1 | fail | fail | fail | |
Aaon black | 11.04:1 | 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 #3dcfd1 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
Fonts for this mood
#3dcfd1 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3dcfd1
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 #3dcfd1 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3dcfd1-a2babe-d45992-1f272d-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