Brand color
Astro Primary
#3178c6rgb(49, 120, 198)hsl(211, 60%, 48%)oklch(0.567 0.14 253.3)Astro Primary on this page is the real value, not a screenshot: exact hex, RGB, HSL and OKLCH, ten tints and ten shades, classic harmonies, and WCAG contrast with fixes — plus the 3 public brands that use it and the palettes it appears in.
Colors that go with Astro Primary
Charcoal, Crimson and Copper 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 Astro Primary: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with Astro Primary — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Copper #b87333
complementaryshippedCopper sits directly opposite Astro Primary 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 Astro Primary in 11 real palettes, including Wired's brand system and Walmart's brand system, as the accent.
Blue #0000ff
shipped14 real palettes, including Readymag's brand system and Activision's brand system put Blue beside Astro Primary, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with Astro Primary: 12 real palettes, including Hershey's's brand system and General Mills's brand system, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with Astro Primary: 5 real palettes, including NBA's brand system and Coca-Cola's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with Astro Primary: 8 real palettes, including Astro's brand system and Deep Water, as the supporting colour.
Real palettes that use Astro Primary
Tints & shades
Harmonies
Contrast
| Astro Primary as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.53:1 | pass | pass | fail |
|
Aaon black | 4.63:1 | 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 Astro Primary as the background.
Brands using this color
Fonts for this mood
Astro Primary 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 #3178c6 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3178c6-9cabc4-df534e-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