Slack vs Microsoft Teams
Last updated July 2026
Slack
The best-of-breed messaging platform for modern teams
Advantages
- Cleanest messaging UX in the category, channels, threads, huddles
- 2,600+ app integrations, including Slack Connect for external teams
- Slack AI summarizes channels, threads, and provides answer generation
- Huddles offer lightweight audio/video without full meeting overhead
- Free tier is workable for small teams with modest history retention
Drawbacks
- Free tier retains only 90 days of message history
- Video calling (huddles) is less polished than Zoom or Teams
- $7.25/user/mo Pro is expensive next to Teams bundled with Microsoft 365
Microsoft Teams
Team communication bundled inside Microsoft 365
Advantages
- Included with Microsoft 365 Business Basic ($6/user/mo) and up
- Deep integration with Word, Excel, PowerPoint, OneDrive, and SharePoint
- Full video meeting platform (rivals Zoom) built in
- Live captions, transcription, and Copilot AI features
- Enterprise-grade compliance and admin controls
Drawbacks
- UX is notoriously heavier and less snappy than Slack
- External collaboration (guests) is clunkier than Slack Connect
- Chat organization feels cluttered vs Slack's channel model
Slack and Microsoft Teams are the two dominant team communication platforms. Slack pioneered the modern channel-based workspace and remains the best pure messaging experience. Teams is bundled with Microsoft 365 and has become the default for Microsoft-heavy enterprises. Bundle economics often outweigh product quality.
Feature Comparison
| Feature | Slack | Microsoft Teams |
|---|---|---|
| Starting Price | Free (limited); Pro $7.25/user/mo | Bundled with Microsoft 365 ($6/user/mo Business Basic) |
| Messaging UX | Best-in-class channels, threads, huddles | Channel + chat; heavier than Slack |
| Video Conferencing | Huddles (audio/video); lighter than Zoom | Full-featured meetings (rivals Zoom) |
| Integrations | 2,600+ apps | 1,500+ apps (Microsoft ecosystem strongest) |
| External Collaboration | Slack Connect with other Slack workspaces | Guest access; less fluid than Slack Connect |
| AI Features | Slack AI (Pro+ tiers, additional add-on) | Copilot for Microsoft 365 ($30/user/mo add-on) |
| File Storage | 5GB free; 10GB/user Pro; unlimited on Enterprise Grid | 1TB/user via OneDrive (bundled) |
| Offline Support | Limited | Solid via desktop apps |
Microsoft Teams Wins
Teams wins for most organizations because it's bundled with Microsoft 365, Slack must justify its $7.25/user/mo on top of software you likely already pay for.
Product-wise, Slack is the better pure messaging experience. But Teams comes free with M365, and most organizations already pay Microsoft for Word, Excel, and Outlook. Paying an incremental $87/user/yr for Slack on top only makes sense when messaging quality genuinely drives business outcomes, true for product teams, engineering, and startups. For most companies, Teams is the right pragmatic answer.
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