Color
#3d99db
#3d99dbrgb(61, 153, 219)hsl(205, 69%, 55%)oklch(0.658 0.131 243.6)Colors that go with #3d99db
Charcoal, Midnight Blue and Orange Red 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 #3d99db: softer than #000 and cool enough to feel like part of the same palette.
Midnight Blue #191970
shippedMidnight Blue is paired with #3d99db in 4 real palettes, including Blue Mono and Plaid's brand system, as the text colour against it — a combination designers have actually shipped, not a computed rotation.
Orange Red #ff4500
shippedOrange Red is paired with #3d99db in 5 real palettes, including Heatwave and Launch Orange, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Taupe #483c32
shippedTaupe is paired with #3d99db in 8 real palettes, including Retool's brand system and Notion's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Bronze #cd7f32
complementaryBronze sits directly opposite #3d99db on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #3d99db: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #3d99db in 3 real palettes, including Heatwave and Beach Hut, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Deep Sky Blue #00bfff
shippedDeep Sky Blue is paired with #3d99db in 3 real palettes, including Remix's brand system and Blueprint, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #3d99db
Tints & shades
Harmonies
Contrast
| #3d99db as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.1:1 | fail | pass | fail | |
Aaon black | 6.78:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3d99db as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#3d99db reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #3d99db and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3d99db-9cafc4-df4e58-1f212d-e9f1f0?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