Companies using Slack 390K+ and counting.
Incumbently sees 390K+ companies using Slack. 420+ started in the last 90 days and 0 stopped. Each one shows the signal type we found and when.
Slack customers, newest first.
Each row shows when we first saw the tool and the type of signal that confirms it.
Every signal behind the list.
Microsoft 365 behind MimecastShows adoptionWhere Slack leavers go.
Share of companies that stopped using it and started using a rival in the same period.
Industries.
Company size.
Slack usage, answered.
Incumbently sees 390K+ companies using Slack as of Nov 6, 2026. A company counts once we have a dated signal for it, such as a DNS record or website code.
420+ companies started using Slack in the last 90 days, and 1,800+ in the last 12 months. The newest are at the top of the list above.
0 in the last 90 days. Of the leavers we could follow, the most started using Zoom (100%).
The biggest industry is IT Services and IT Consulting (5% of companies), and 51–200 staff is the most common company size.
Agents read public signals around the clock, such as DNS records, subdomains, website code and job posts. Each company shows the type of signal we found and when.
Sell to Slack customers?
Track Slack and get an alert the week one of its customers adopts or drops a tool. Start free, no card needed.