Brand color
Slack Primary
#1264a3rgb(18, 100, 163)hsl(206, 80%, 35%)oklch(0.491 0.124 248.1)Slack 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 Slack Primary
Charcoal, Crimson 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 Slack Primary: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with Slack Primary — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Royal Blue #4169e1
analogousshippedRoyal Blue is Slack Primary's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite Slack 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 Slack Primary in 8 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour.
Blue #0000ff
shipped7 real palettes, including Activision's brand system and Tesco's brand system put Blue beside Slack Primary, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with Slack Primary: 4 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 Slack Primary: 4 real palettes, including Venmo's brand system and Deep Water, as the supporting colour.
Real palettes that use Slack Primary
Tints & shades
Harmonies
Contrast
| Slack Primary as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.22:1 | pass | pass | fail |
|
Aaon black | 3.38:1 | 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 Slack Primary as the background.
Brands using this color
Fonts for this mood
Slack 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 #1264a3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/1264a3-9caec4-df4e56-1f212d-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