Slack's primary color is called "Aubergine" — a deep purple-brown that was a genuine risk for a B2B product. Paired with four bright accent colors, it ended up being one of the most distinctive palettes in workplace software.
Slack's Aubergine (#4A154B) was a calculated risk — it's unusual for a B2B SaaS product to lead with a deep purple-brown. But it differentiates Slack completely from the blue-dominant enterprise software world. The four hashtag colors — red, blue, green, yellow — were chosen to always appear as distinct hues regardless of color blindness type (deuteranopia, protanopia, tritanopia). In the logo, the four circles are intentionally offset from perfectly perpendicular to create visual tension and energy.
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