Slack vs. Microsoft Teams: Bundling Is Winning the User-Count War, Not Features
Microsoft Teams now claims more total users than Slack, but the gap says more about Microsoft 365 licensing strategy than about which tool is actually better designed.
Total user count is a misleading metric when one competitor ships its product bundled into licensing millions of organizations already buy for unrelated reasons. Teams' growth has tracked Microsoft 365 adoption closely — most new Teams users didn't choose it over Slack in a head-to-head evaluation, they got it by default with Office.
This matters for buyers because the "more popular" tool isn't necessarily the better fit for a specific team. Organizations not already locked into Microsoft 365 licensing should still evaluate both products directly rather than assuming Teams' larger user base reflects a product quality verdict.
Our Slack and Microsoft Teams reviews go deeper on the specific feature and pricing tradeoffs.
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