Slack pricing spans a free tier plus paid Pro and Business+ plans, with each step up changing both collaboration limits and administrative controls. For growing teams, the buying decision is less about chat itself and more about when message retention, app integrations, external collaboration, AI features, and identity management become operational requirements.
What it is and who it’s for
Slack is a workplace messaging and collaboration platform sold in tiered plans called Free, Pro, Business+, and Enterprise+. For teams evaluating Slack pricing, the three most relevant options for self-serve growth are Free for basic use, Pro as Slack’s productivity plan for teams, and Business+ as its scale-oriented tier.
The Free plan fits teams that need a no-cost starting point. Pro is aimed at teams that have outgrown basic limits. Business+ is the step for organizations that need stronger administration and security controls alongside collaboration features.
How it works
Slack packages access by plan, with higher tiers expanding retention, integrations, meetings, external collaboration, AI, and identity controls.
On Free, teams get 90 days of searchable message history, up to 10 apps, 1:1 meetings through Slack huddles with audio, video, and screen sharing, 1:1 external messages through Slack Connect, and Basic AI. Slack’s help documentation adds an important retention detail: messages and files in a Free workspace are stored for one year only, and any content older than that is permanently deleted.
Pro removes key usage caps that often matter once a team standardizes on Slack. It includes unlimited message history, unlimited app integrations, group meetings via Slack huddles, and group external messages with up to 250 organizations.
Business+ keeps those collaboration capabilities and adds the admin and security layer: Advanced AI, Slackbot (which Slack describes as a personal AI agent, subject to plan limits), SAML-based single sign-on, SCIM user management, EMM integration support, built-in data loss prevention (DLP), and support for 12 SSO options including Okta, Google, and Azure.
Pricing and cost considerations
The published Slack pricing on the vendor pricing page uses standard per-user rates, with annual billing cheaper than monthly on both paid tiers and Enterprise+ quoted through sales rather than sold self-serve.
| Plan | Monthly (per user) | Annual (per user) |
|---|---|---|
| Free | $0 | $0 |
| Pro | $8.75 | $7.25 |
| Business+ | $18 | $15 |
| Enterprise+ | Contact sales | Contact sales |
Before seat price, weigh the feature caps. Free limits a team to 10 apps, while both paid tiers include unlimited app integrations, so a team that leans on many connected tools can hit a functional ceiling on Free well before the seat rate becomes the deciding factor. Support also steps up by tier: Slack’s help documentation says Pro includes 24/7 support, while Business+ includes 24/7 support with a 4-hour first response time.
As a worked example, a 25-person team on Pro billed annually runs about $181 a month, while the same team on Business+ runs about $375 — so the gap between the two paid tiers is usually a larger budgeting decision than the initial jump off Free.
How to choose
Choose Free if the team mainly needs internal messaging, a small number of integrations, and lightweight one-to-one meetings or outside conversations, since that plan includes 1:1 Slack Connect messages and 1:1 huddles.
Choose Pro when the bottleneck is operational, not experimental. If a team needs complete message continuity, broad integration coverage, group huddles, or external group collaboration, Pro is the first plan in Slack’s lineup that confirms those capabilities, including group external messages with up to 250 organizations. For a similar plan-by-plan breakdown of another team tool, see our Notion pricing guide. Slack’s per-seat model is one of the approaches compared in our SaaS pricing models guide.
Choose Business+ when the purchase decision sits with IT, security, or operations as much as with end users. Its differentiators are administrative controls such as SAML-based single sign-on, SCIM user management, EMM integration support, and built-in DLP controls.
Enterprise+ is primarily intended for large organizations that need contract-based terms and centralized administration beyond Business+, and Slack quotes it through its sales team rather than selling it self-serve.
Limitations and gotchas
The biggest practical limit on Free is not just the 90-day searchable history window: Slack also stores Free-workspace messages and files for one year only, after which older content is permanently deleted.
Some feature labels need close reading during procurement. Slack lists Business+ as including Slackbot with “plan limits apply,” but the exact limits are not defined on the pricing page, so confirm them with Slack before planning heavy AI use on that plan.
FAQ
If we upgrade a Free workspace, do we get our older messages back? Slack says a Free plan can be upgraded to access the previous 12 months of messages, which is separate from the 90-day searchable window on Free itself.
Can Free or Pro teams unlock any admin or security features without moving to Business+? Some security and administration features, marked with an asterisk in Slack’s documentation, are available to Free and Pro customers that have connected a Salesforce org to Slack.
What happens if we pay for a user who later becomes inactive? Slack says that when a paid member becomes inactive, it adds a prorated credit to the account for the unused time, so a paid seat that goes dormant mid-term is not simply forfeited.
