Extract from Peter Callaghan’s article “6 (Major) Benefits of Slack Enterprise Grid”
One of the reasons Slack saw such widespread adoption, especially early on, was the fact that companies could use it for free. Like many SaaS tools, Slack operated on a “freemium” model, meaning organizations could use it for free, and then upgrade as their needs grew.
Slack still offers a free version today, but its paid version now has three pricing tiers. There is the Standard plan, which is aimed at small and medium-sized businesses and priced at $6.67 USD per user per month. The next tier is the Plus plan, which is for larger businesses, priced at $12.50 USD per user per month. Finally, there is Enterprise Grid, which is aimed at large companies, as well as organizations in highly-regulated industries. There is no public pricing for Enterprise Prise Grid—cost depends on the size and complexity of the company.
Unsurprisingly, many organizations continue to stick with the free version, with paid customers making up a relatively small number of active Slack users.