Color
#1b66bb
#1b66bbrgb(27, 102, 187)hsl(212, 75%, 42%)oklch(0.513 0.151 255.1)Colors that go with #1b66bb
Charcoal, Crimson and Sienna 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 #1b66bb: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #1b66bb — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #1b66bb on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #1b66bb in 8 real palettes, including Warner Bros.'s brand system and McDonald's's brand system, as the accent.
Blue #0000ff
shipped17 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #1b66bb, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #1b66bb: 6 real palettes, including Coca-Cola's brand system and Gopro's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #1b66bb: 7 real palettes, including Venmo's brand system and Deep Water, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #1b66bb: 7 real palettes, including Apple's brand system and Venmo's brand system, as the supporting colour.
Real palettes that use #1b66bb
Tints & shades
Harmonies
Contrast
| #1b66bb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.73:1 | pass | pass | fail |
|
Aaon black | 3.66:1 | fail | 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 #1b66bb as the background.
Brands using this color
Fonts for this mood
#1b66bb 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 #1b66bb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/1b66bb-9caac4-df564e-1f202d-e9f1f1?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