Arcade
Open in tool →Hot pink, cyan and acid yellow on near-black — cabinet-glow neon; the black surface is what makes the colours light up.
Color
#3ef3f9
#3ef3f9
hex
#3ef3f9rgb
rgb(62, 243, 249)hsl
hsl(182, 94%, 61%)oklch
oklch(0.88 0.138 198.4)Closest name: Aqua (#0ff0fe)Relative luminance 0.7196
Colors that go with #3ef3f9
Charcoal, Deep Sky Blue and Taupe 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 #3ef3f9: softer than #000 and cool enough to feel like part of the same palette.
Deep Sky Blue #00bfff
analogousshippedDeep Sky Blue is #3ef3f9's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Taupe #483c32
shippedTaupe is paired with #3ef3f9 in 7 real palettes, including Astro's brand system and Boeing's brand system, as the text colour against it.
Light Coral #f08080
complementaryLight Coral sits directly opposite #3ef3f9 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Crimson #dc143c
shippedCrimson is paired with #3ef3f9 in 3 real palettes, including Formula 1's brand system and Tiffany & Co.'s brand system, as the supporting colour.
Light Pink #ffb6c1
shippedLight Pink shows up next to #3ef3f9 in 3 real palettes, including Macaron and Pastel Pop, as the lead colour.
Steel Blue #4682b4
shippedDesigners have shipped Steel Blue with #3ef3f9: 3 real palettes, including Glacier and Astro's brand system, as the lead colour.
Coral #ff7f50
split-complementCoral is a split-complement of #3ef3f9: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #3ef3f9
Tints & shades
Harmonies
Contrast
| #3ef3f9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.36:1 | fail | fail | fail | |
Aaon black | 15.39:1 | 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 #3ef3f9 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
#3ef3f9 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3ef3f9
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 #3ef3f9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3ef3f9-a2babe-d45990-1f272d-e9f1ee?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