Slack’s free plan is surprisingly limited — only 90 days of message history and 10 app integrations. The Pro plan unlocks unlimited history and integrations for $8.75/seat/month. Here’s when it’s worth upgrading and what each tier includes.
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Slack Pricing Plans
- 90-day message history
- 10 app integrations
- 1 workspace
- 1:1 video/voice calls
- Huddles (limited)
- Unlimited message history
- Unlimited app integrations
- Group video/voice calls
- Slack AI (basic)
- Custom retention policies
- SAML SSO
- 99.99% uptime SLA
- Data exports for all messages
- User provisioning
- Advanced admin controls
- Multiple workspaces
- DLP integrations
- HIPAA compliance
- Custom terms of service
- Enterprise key management
Hidden Costs to Watch Out For
- Slack AI is an add-on: Slack AI (search summaries, channel recaps, thread summaries) costs $10/seat/month extra. It’s not included in any base plan.
- Free plan resets history: After 90 days, free plan messages are inaccessible (but not deleted). Teams that rely on searching past decisions will lose context — a real operational cost.
- User count determines price: Every active member in your workspace is billable. Bots and app integrations don’t count, but all human members do — including occasional users.
- Annual billing saves 15%: Pro annually = $7.25/seat/month vs $8.75 monthly. Business+ annually = $12.50 vs $15.00 monthly.
Frequently Asked Questions About Slack Pricing
Is Slack free for small teams?
Slack’s free plan is available to teams of any size but limits you to 90 days of message history and 10 app integrations. For most professional teams, the Pro plan ($8.75/seat/month) is the minimum practical option.
How much does Slack cost for a team of 10?
10 users on Slack Pro costs $87.50/month (monthly billing) or $72.50/month billed annually. Business+ for 10 users is $150/month or $125/month annually.
What’s the difference between Slack Pro and Business+?
The key additions in Business+ are: SAML SSO, 99.99% SLA, data exports for all messages, and user provisioning. For most small businesses, Pro is sufficient. Business+ is for companies with compliance or security requirements.
Does Microsoft Teams compete with Slack on price?
Microsoft Teams is included in Microsoft 365 plans starting at $6/user/month — cheaper than Slack Pro. If your team already uses Microsoft 365, Teams may be more economical. Slack’s advantage is its integrations ecosystem and user experience for non-Microsoft orgs.