Blueprint
Open in tool →Cyan and indigo on navy is the developer-tool look; amber is the only warm note, so it always reads as 'attention'.
Color
#09c3fb
#09c3fb
hex
#09c3fbrgb
rgb(9, 195, 251)hsl
hsl(194, 97%, 51%)oklch
oklch(0.763 0.148 227.8)Closest name: deepskyblue (#00bfff)Relative luminance 0.4605
Colors that go with #09c3fb
Charcoal, Midnight Blue and Royal 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 #09c3fb: softer than #000 and cool enough to feel like part of the same palette.
Midnight Blue #191970
shippedMidnight Blue is paired with #09c3fb in 6 real palettes, including Kraken's brand system and Confluent's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Royal Blue #4169e1
shippedRoyal Blue is paired with #09c3fb in 7 real palettes, including 1password's brand system and Elastic's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Taupe #483c32
shippedTaupe is paired with #09c3fb in 5 real palettes, including Astro's brand system and Cursor's brand system, as the text colour against it — a combination designers have actually shipped, not a computed rotation.
Coral #ff7f50
complementaryCoral sits directly opposite #09c3fb 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 #09c3fb: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #09c3fb in 3 real palettes, including Blueprint and Salesforce's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Blue Violet #8a2be2
shippedBlue Violet is paired with #09c3fb in 3 real palettes, including Circuit and Render's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #09c3fb
Tints & shades
Harmonies
Contrast
| #09c3fb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.06:1 | fail | fail | fail | |
Aaon black | 10.21:1 | 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 #09c3fb as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#09c3fb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #09c3fb
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 #09c3fb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/09c3fb-9cb6c4-df4e72-1f242d-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