Slack: The $27 billion team collaboration giant born from the ruins of a failed game

Origin

The Butterfield team originally spent 3 years and burned over $17 million in funding developing the MMO web game Glitch. In December 2012, the game was forced to shut down as daily active users fell far short of expectations. During development, the team had built an internal collaboration tool for daily communication and task management. After Glitch failed, they realized this internal tool offered a collaboration experience far superior to the email and instant messaging solutions on the market, so they decided to polish it into a standalone SaaS product. This marked a complete transformation from a gaming company to an enterprise collaboration tool company.

Milestones

Turning Points

• In 2009, Butterfield left Yahoo to found Tiny Speck and develop Glitch, reassembling the core Flickr team and beginning his second entrepreneurial journey.
• In 2012, after 3 years and $17 million in investment, Glitch was shut down. The team identified the business potential of their internal collaboration tool and pivoted decisively.
• In August 2013, Slack launched with 8,000 team registrations on day one. Eight months later, it reached a $1 billion valuation, becoming the fastest unicorn in history and validating B2B collaboration market demand.
• In 2021, Salesforce acquired Slack for $27.7 billion, marking the deep integration of an independent collaboration SaaS with a CRM giant and closing a chapter in Butterfield's career.
• In 2026, Salesforce rebuilt Slackbot as the core of its AI agent platform, evolving Slack from a chat tool into a central hub for enterprise AI workflow orchestration.

Failures & Pitfalls

• After 3 years and over $17 million in funding, the Glitch game was officially shut down in December 2012 with only a few thousand daily active users, far below expectations, forcing the 35-person team to disband.
• Butterfield's first venture, Game Neverending, also failed due to an overly idealistic game concept, eventually forcing the team to spin off the photo feature and sell it to Yahoo.
• After Slack's direct listing in 2019, its stock price continued to fall, dropping from an opening of about $38 to around $20 in 2020, as the market lacked confidence in the long-term profitability of standalone collaboration SaaS.
• Following the acquisition by Salesforce, Butterfield resigned at the end of 2022. The integration period was marked by cultural conflicts and strategic misalignment, hindering deep synergy.

Core Data

• Annual Recurring Revenue FY2021：Approx. $872 million (Company disclosure, as of 2026, independent verification not performed)
• Acquisition Price：Approx. $27.7 billion (Company disclosure, as of 2026, independent verification not performed)
• 2014 Valuation Milestone：Approx. $1 billion (Became a unicorn 8 months after launch) (Company disclosure, as of 2026, independent verification not performed)
• 2020 Daily Active Users：Approx. 12 million (Company disclosure, as of 2026, independent verification not performed)
• Paid Conversion Rate：Over 30% (Company disclosure, as of 2026, independent verification not performed)
• Team Size at Acquisition：Approx. 2,000 (Company disclosure, as of 2026, independent verification not performed)
• App Integrations：Over 2,400 (Company disclosure, as of 2026, independent verification not performed)
• Cumulative Funding：Over $1.2 billion (Company disclosure, as of 2026, independent verification not performed)

Competitors / Peers

Microsoft Teams is Slack's largest direct competitor, leveraging the Office 365 ecosystem for bundled sales; in 2020, it had over 115 million daily active users, far exceeding Slack's ~12 million. Google Chat and Workspace compete through AI integration; in 2026, Google deeply embedded Gemini AI into Workspace to build a competitive moat. In China, DingTalk and WeCom rely on the Alibaba and Tencent ecosystems, covering over 600 million and hundreds of millions of users, respectively. Vertical collaboration tools like Asana, Notion, and monday provide supplementary competition in specific scenarios. In the 2026 AI Agent wave, the deep integration of Microsoft Copilot for Microsoft 365 and Salesforce Agentforce with Slack will become the ultimate battlefield for enterprise AI collaboration, where victory depends on who can truly embed AI agents into daily workflows rather than keeping them at the conversational level.