How much does Slack cost in 2026?
Quick Answer: Slack: Free (90-day history, 10 integrations), Pro $7.25/user/mo (full history, unlimited integrations), Business+ $12.50/user/mo (SSO, compliance). Slack AI add-on $10/user/mo. 100-user Pro team costs $725/month. Microsoft Teams is included with M365 at no extra cost.
Slack Pricing (as of April 2026)
| Plan | Price | Key Features |
|---|---|---|
| Free | $0 | 90-day message history, 10 integrations, 1:1 huddles, basic Workflow Builder |
| Pro | $7.25/user/month | Full message history, unlimited integrations, group huddles, advanced Workflow Builder |
| Business+ | $12.50/user/month | SSO/SAML, data exports, compliance features, 99.99% uptime SLA |
| Enterprise Grid | Custom | Multi-workspace, DLP, eDiscovery, HIPAA eligible, custom retention |
Annual billing for Pro saves approximately 14% ($8.75/user monthly vs $7.25 annual).
Free Plan Limitations
| Feature | Free | Pro |
|---|---|---|
| Message history | 90 days | Unlimited |
| Integrations | 10 | Unlimited |
| File storage | 5 GB/workspace | 10 GB/member |
| Huddles | 1:1 only | Group (up to 50) |
| Workflow Builder | Basic | Advanced |
| Canvases | Basic | Full |
The 90-day message history limit is the most impactful restriction. Messages older than 90 days are hidden (not deleted) and reappear upon upgrading. For teams that rely on searchable conversation history, the free plan is insufficient.
Cost at Scale
| Team Size | Free | Pro | Business+ | Annual Pro | Annual Business+ |
|---|---|---|---|---|---|
| 10 users | $0 | $73/mo | $125/mo | $870/yr | $1,500/yr |
| 25 users | $0 | $181/mo | $313/mo | $2,175/yr | $3,750/yr |
| 50 users | $0 | $363/mo | $625/mo | $4,350/yr | $7,500/yr |
| 100 users | $0 | $725/mo | $1,250/mo | $8,700/yr | $15,000/yr |
| 500 users | $0 | $3,625/mo | $6,250/mo | $43,500/yr | $75,000/yr |
Slack AI Add-On
Slack AI (launched 2024) is available as an add-on at $10/user/month on Pro and Business+ plans. Features include AI-powered search, conversation summaries, channel recaps, and thread digests. For a 100-user team on Pro, adding Slack AI increases cost from $725/month to $1,725/month.
Slack vs Microsoft Teams Cost
| Scenario | Slack Pro | Microsoft Teams (in M365 Business Basic) |
|---|---|---|
| 50 users — messaging only | $363/mo | $300/mo ($6/user, includes Teams + web Office apps) |
| 50 users — messaging + AI | $863/mo ($363 + $500 AI) | $300/mo (Copilot AI add-on $30/user extra) |
| Effective messaging cost for M365 users | $363/mo (additional tool) | $0 (already included) |
For organizations already on Microsoft 365, Teams is included at no additional cost, making Slack an added expense. For organizations not on Microsoft 365, Slack Pro''s $7.25/user is competitive.
Editor''s Note: We evaluated Slack Pro vs Microsoft Teams for a 200-person consulting firm. Slack Pro cost: $1,450/month ($17,400/year). The firm was already on Microsoft 365 Business Standard ($12.50/user, $30,000/year) which includes Teams. Adding Slack would cost $17,400/year on top of existing M365. We recommended using Teams for messaging and Slack for a 30-person engineering team that needed the GitHub/Jira integrations Teams lacked — $217/month for 30 Pro seats. Saved $14,790/year vs company-wide Slack.
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