Microsoft Teams
Slack
Microsoft Teams
Slack
Microsoft Teams
Slack
Microsoft Teams
Slack
No signals
Microsoft Teams
Slack
No signals
Microsoft Teams
No signals
Slack
Microsoft Teams
No signals
Slack
Microsoft Teams
No signals
Slack
Users: Unlimited users
Storage: 5GB per user
Limits: 60-minute group call limit, No phone system, No admin tools, 5GB storage cap
Users: Up to 300 users
Storage: 10GB per user
Limits: No Office apps, No business email, No SharePoint
Users: Up to 300 users
Storage: 1TB per user
Limits: No desktop Office apps, No advanced security, Copilot $30/user extra
Users: Up to 300 users
Storage: 1TB per user
Limits: 300 webinar limit, No advanced security features
Users: Up to 300 users
Storage: 1TB per user
Limits: Phone system not included, Limited to 300 users
Users: Unlimited
Storage: Varies by M365 plan
Limits: Not standalone - requires Enterprise M365 license
Users: Unlimited users
Storage: 5GB total
Limits: No SSO, No compliance exports, No guest access controls, No custom retention policies, Cannot recover data after 1 year
Users: Minimum 3 users required
Storage: 10GB per user
Limits: No SSO/SAML, No data exports for compliance, No user provisioning, No audit logs
Users: Per user pricing
Storage: 20GB per user
Limits: No Enterprise Key Management, No HIPAA compliance, No unlimited workspaces, Cannot downgrade if you later upgrade to Grid
Users: Unlimited workspaces
Storage: 1TB per user
Limits: Annual commitment required, Cannot downgrade to Business+ ever, Multi-year contracts often required for discounts
| Feature | Microsoft Teams | Slack |
|---|---|---|
| Communication | ||
| Team chat and channels Core feature, search less capable than Slack | ||
| Real-time messaging Channels, DMs, threads | ||
| Video calls Huddles and integrations, up to 50 people on paid plans | ||
| Phone system Teams Phone add-on required, $15-20/user extra | ||
| Meetings | ||
| Video conferencing Up to 300 participants on business plans | ||
| Screen sharing With annotation and control options | ||
| Data | ||
| Message history Free: 90 days visible, 1 year then deleted. Paid: Unlimited | ||
| Data export Business+ and above for compliance exports | ||
| Productivity | ||
| Office app integration Edit Word/Excel/PPT directly in Teams | ||
| Outlook calendar integration Sync can have issues | ||
| Integrations | ||
| Third-party integrations 2,600+ apps. Free plan limited to 10 integrations | ||
| Third-party app integrations Fewer than Slack (2,600+ apps) | ||
| Storage | ||
| SharePoint file storage Can make finding files confusing | ||
| OneDrive sync 1TB per user on Business plans | ||
| Security | ||
| SSO/SAML Business+ and above only ($15/user) | ||
| End-to-end encryption 1:1 calls only by default | ||
| Compliance certifications HIPAA, SOC 2, ISO 27001, etc. | ||
| AI | ||
| Slack AI Separate $10/user add-on, must buy for ALL users | ||
| AI assistant (Copilot) $30/user/month add-on | ||
| Collaboration | ||
| Guest access More complex than competitors | ||
| Accessibility | ||
| Mobile app iOS and Android, notification reliability issues | ||
| Enterprise | ||
| Audit logs Enterprise+ only ($45/user) | ||
| Events | ||
| Webinars Business Standard+ or Teams Premium | ||
| Compliance | ||
| HIPAA compliance Enterprise+ only | ||
| FedRAMP authorized Moderate authorization available | ||
| Compatibility | ||
| Cross-platform apps Mac experience significantly worse than Windows | ||
