Color
#3578bb
#3578bbrgb(53, 120, 187)hsl(210, 56%, 47%)oklch(0.562 0.124 251)Colors that go with #3578bb
Charcoal, Crimson and Amber 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 #3578bb: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #3578bb — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #3578bb in 8 real palettes, including Wired's brand system and Lemon Squeezy's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Blue #0000ff
shippedBlue is paired with #3578bb in 11 real palettes, including Pixar's brand system and Readymag's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Cobalt Blue #0047ab
shippedCobalt Blue is paired with #3578bb in 7 real palettes, including Hershey's's brand system and Glacier, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Deep Sky Blue #00bfff
shippedDeep Sky Blue is paired with #3578bb in 5 real palettes, including Astro's brand system and Deep Water, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Dodger Blue #1e90ff
shippedDodger Blue is paired with #3578bb in 4 real palettes, including Apple's brand system and HashiCorp's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Firebrick #b22222
shippedFirebrick is paired with #3578bb in 4 real palettes, including AT&T's brand system and Wendy's's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #3578bb
Tints & shades
Harmonies
Contrast
| #3578bb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.61:1 | pass | pass | fail |
|
Aaon black | 4.56:1 | 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 #3578bb as the background.
Brands using this color
Fonts for this mood
#3578bb reads as cool, modern. 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 #3578bb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3578bb-9cabc4-df514e-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