Microsoft Teams vs Slack
Microsoft Teams and Slack are both team chat software. Microsoft Teams is a commercial product from Microsoft. Slack is a commercial product from Salesforce, Inc.
Which to pick
- Pick Microsoft Teams when
- Your business already pays for Microsoft 365 and wants chat and video meetings without another vendor.
- Pick Slack when
- A team wants the chat tool with the widest integration ecosystem and is willing to pay per seat.
Side by side
Chat, meetings, calls and file collaboration built on Microsoft 365, with SharePoint behind team files and optional phone system.
Team messaging organised into channels and threads, with huddles, shared channels between companies, workflows and thousands of app integrations.
The client is heavy and the chat experience is clumsier than Slack; in the EU it is now sold separately from some Microsoft 365 plans.
Per-seat pricing is high, the free plan hides history older than 90 days, and Salesforce keeps tightening API access.
Production-ready (both)
Cloud service, desktop app and mobile app (both)
Not published (both)
Closed source, sold by Microsoft
Closed source, sold by Salesforce, Inc.
Closed source: you use it under the maker's terms and cannot change or resell the code. (both)
20k Wikipedia readers a month on phones
8.4k Wikipedia readers a month on phones
Other comparisons
More team chat apps
Both sides were judged on 2026-11-03 from makers' descriptions, Wikipedia, READMEs and GitHub data. License, age and popularity lines are worked out directly.