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
#3bc9c0
#3bc9c0
hex
#3bc9c0rgb
rgb(59, 201, 192)hsl
hsl(176, 57%, 51%)oklch
oklch(0.76 0.118 188.7)Closest name: Cockatoo (#58c8b6)Relative luminance 0.4651
Colors that go with #3bc9c0
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 #3bc9c0: 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 Unity's brand system put Blue beside #3bc9c0, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3bc9c0 in 5 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 #3bc9c0: 4 real palettes, including Unity's brand system and Patreon's brand system, as the lead colour.
Midnight Blue #191970
shipped4 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #3bc9c0, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #3bc9c0 in 4 real palettes, including Khan Academy's brand system and Docker's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #3bc9c0 in 16 real palettes, including Crayon Box and Resort, as the text colour against it.
Light Coral #f08080
complementaryLight Coral sits directly opposite #3bc9c0 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 #3bc9c0
Tints & shades
Harmonies
Contrast
| #3bc9c0 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.04:1 | fail | fail | fail | |
Aaon black | 10.3:1 | 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 #3bc9c0 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 #3bc9c0
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 #3bc9c0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3bc9c0-a2bdbe-d4599d-1f282d-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