Is Slack Free? What You Get, What You Lose, and When to Upgrade
Slack's free plan works well for small teams, but the restrictions add up faster than you expect. Here is an honest breakdown of what's included, what's limited, and when you need to pay.
What the Free Plan Includes
What the Free Plan Limits
90-day message history
Messages beyond 90 days disappear from search and channel views. After one year, they are permanently deleted with no recovery option. This is the single biggest limitation of the free plan.
10 active integrations
You can only connect 10 third-party apps at a time. Need Jira, GitHub, Google Calendar, Zoom, and six others? You are already at the limit. Removing one integration to add another is disruptive.
1:1 calls only
No group audio or video calls. No huddles. No screen sharing in calls. If your team needs to meet, you will need a separate tool like Zoom or Google Meet.
No SSO or compliance
No SAML SSO, no SCIM provisioning, no compliance data exports, no custom retention policies. If you work in a regulated industry, the free plan is not viable.
5 GB total storage
That is 5 GB for the entire workspace, not per user. A team of 10 sharing files will exhaust this quickly. Once full, you cannot upload files until you delete others.
No Slack AI
No conversation summaries, no AI-powered search, no huddle notes, no translations. These features are reserved for paid plans.
When Free Stops Working
| Team size | Free plan viability | Key pain point |
|---|---|---|
| 1-5 users | Works fine | Integration limit may be tight for developer teams |
| 5-15 users | Workable with trade-offs | 90-day history makes onboarding new members difficult |
| 15-25 users | Significant friction | 10-integration limit becomes blocking. No group calls. |
| 25-50 users | Not recommended | Storage exhausted. Message loss impacts knowledge retention. |
| 50+ users | Not viable | Compliance requirements, SSO needs, and scale issues. |
Free vs Pro Comparison
| Feature | Free | Pro ($8.75/user/mo) |
|---|---|---|
| Message history | 90 days | Unlimited |
| Integrations | 10 | Unlimited |
| Calls | 1:1 only | Group huddles (50) |
| Slack AI | No | Basic (summaries, notes) |
| Storage | 5 GB total | 10 GB per user |
| Screen sharing | No | Yes |
| Workflow Builder | Basic | Full |
Cost to upgrade a 10-person team from Free to Pro: $87.50/month (monthly) or $72.50/month (annual).
Free Alternatives to Slack
Discord
Free
Best for: Communities, startups
Pros: Unlimited history, 25-person video, rich voice channels
Cons: No business compliance features, perceived as gaming platform
Pumble
Free (unlimited users)
Best for: Teams wanting Slack-like UX for free
Pros: Unlimited message history, unlimited users, video calls
Cons: Fewer integrations, smaller ecosystem
Google Chat
Included with Workspace ($7/user/mo)
Best for: Google Workspace users
Pros: Deep Drive/Docs integration, good search
Cons: Requires Workspace subscription, simpler feature set
Frequently Asked Questions
Is Slack free forever?
Yes. Slack's free plan has no time limit and no credit card required. You can use it indefinitely. However, the restrictions are significant: 90-day searchable message history, messages older than one year are permanently deleted, 10 active integrations maximum, 1:1 calls only, and 5 GB total workspace storage. These limitations become increasingly painful as your team grows.
What happens to messages older than 90 days on the free plan?
Messages older than 90 days are hidden from search results and channel history. You can still access them through direct links or exports for up to one year. After one year, messages on the free plan are permanently and irreversibly deleted. There is no recovery option. If your team relies on message history for context or compliance, this is a deal-breaking limitation.
Can I use Slack free for a large team?
Technically, yes. There is no user limit on the free plan. However, practical limitations make it unsuitable for teams larger than about 15 to 20 people. The 10-integration limit restricts workflow automation, the 90-day history makes onboarding difficult, and the lack of group calls prevents team meetings. Most teams outgrow free at around this size.
What free alternatives to Slack exist?
Discord offers unlimited message history, video calls for up to 25 people, and rich community features, all for free. Pumble provides unlimited message history for unlimited users on its free plan. Google Chat is included free with Google Workspace accounts. Each has trade-offs: Discord lacks business compliance features, Pumble has fewer integrations, and Google Chat requires a Workspace subscription for full functionality.