Slack's pricing tiers and what each one costs

Slack offers four subscription plans: Free, Pro, Business+, and Enterprise Grid. The Free plan costs nothing and includes basic messaging, file storage up to 5 GB, and access to the 90 most recent messages. The Pro plan costs $8.75 per user per month (billed annually) or $10.50 per month (billed monthly), and removes the message limit while adding features like custom workflows and priority support. Business+ costs $12.50 per user per month (annual) or $15 per month (monthly), and includes advanced security, compliance tools, and analytics. Enterprise Grid has no fixed price — you contact Slack's sales team for a quote based on your organization's size and needs.

Pricing is per active user, meaning you pay only for people who actually use the workspace in a given month. If someone is invited but never logs in, or if you remove someone from the workspace, you do not pay for that seat. Slack counts an active user as anyone who has posted a message, opened the app, or interacted with the workspace at least once during the billing month.

All plans include unlimited channels, the ability to create workflows, and integrations with other tools. The main differences are message history, support tier, security features, and administrative controls. Free workspaces cannot search messages older than 90 days, while paid plans have unlimited search history.

Key Takeaways

  • Free workspaces cost nothing but limit you to the 90 most recent messages and 5 GB of file storage.
  • Pro ($8.75–$10.50 per user per month) removes message limits and adds custom workflows and priority support.
  • Business+ ($12.50–$15 per user per month) includes advanced security, compliance tools, and workspace analytics.
  • Enterprise Grid requires a custom quote from Slack's sales team and is designed for very large organizations.
  • You pay only for active users who actually use the workspace in a given month, not for invited members who never log in.

How billing works and when charges occur

Slack charges at the end of each billing cycle — either monthly or annually, depending on which option you choose. If you pay monthly, you are billed on the same date each month. If you pay annually, you are billed once per year and receive a discount compared to the monthly rate. For example, Pro costs $10.50 per month if billed monthly, but $8.75 per month if you commit to annual billing.

The workspace owner or billing administrator sets up payment through a credit card or, for Enterprise Grid, through an invoice. Slack sends an invoice to the email address on file before charging the card. If your card is declined, Slack will attempt to charge it again over several days. If payment fails permanently, the workspace downgrades to Free after a grace period.

If you add new users mid-cycle, Slack prorates the charge — you pay only for the portion of the month those users are active. If you remove users, the credit appears on your next invoice or can be applied to future charges.

Free plan limitations and when to upgrade

The Free plan works for very small teams or short-term projects, but it has real constraints. You can see only the 90 most recent messages in any channel, which means older conversations disappear from view. This makes it hard to onboard new team members or find decisions made weeks ago. File storage is capped at 5 GB total for the entire workspace, so teams that share many documents or images will run out quickly.

Free workspaces also lack custom workflows, which let you automate tasks like collecting information or routing messages. Support is limited to a community forum rather than direct help from Slack staff. If your team is growing or you need to keep a searchable record of conversations, Pro is usually the minimum viable option.

Many organizations start on Free and upgrade to Pro once they have more than five or six active users or need to reference older messages regularly. Business+ becomes relevant when you need compliance features like data loss prevention, audit logs, or the ability to export all workspace data for legal or regulatory reasons.

Discounts, annual billing savings, and nonprofit pricing

Slack offers a 20 percent discount if you pay for a full year upfront instead of month to month. On Pro, this brings the per-user cost from $10.50 per month to $8.75 per month. The discount applies to Pro and Business+ but not to Free or Enterprise Grid.

Slack also offers discounted pricing for nonprofits and educational institutions. Nonprofits registered with TechSoup can receive a 50 percent discount on Pro and Business+ plans. Universities and schools may have different rates depending on their agreement with Slack. You will need to verify your nonprofit or educational status through the appropriate verification service.

Volume discounts are not automatic on Pro or Business+ — they apply only to Enterprise Grid customers, where pricing is negotiated based on the number of users and contract terms. If you have hundreds of users, contacting Slack's sales team may result in a better rate than paying the standard per-user price.

What happens if you downgrade or cancel

If you downgrade from a paid plan to Free, your workspace keeps all its data, but you lose access to paid features immediately. Messages older than 90 days become unsearchable, custom workflows stop running, and you lose priority support. Files remain in the workspace, but you cannot upload new files if you exceed the 5 GB limit.

If you cancel your subscription entirely, Slack gives you a 30-day grace period to download your data. After 30 days, the workspace is deleted and cannot be recovered. During the grace period, the workspace is read-only — team members can view messages and files but cannot post or make changes.

If you downgrade mid-cycle, Slack credits the difference to your account. For example, if you downgrade from Business+ to Pro halfway through a monthly billing cycle, you receive a credit for the unused portion of Business+ that you can apply to your Pro charges or future invoices.

Hidden costs and things that affect your total bill

The per-user pricing is straightforward, but a few things can increase your total cost. If you use Slack's paid apps or integrations from the App Marketplace, some charge additional fees. These are separate from your Slack subscription and vary by app — some are free, some charge per user, and some charge a flat monthly fee.

If you use Slack Connect, which lets you share channels with people outside your organization, there is no extra charge, but those external users must have their own Slack workspace. If they are on a Free plan, they have the same message and storage limits.

Slack does not charge for the number of channels, integrations, or workflows you create. It does not charge for file storage beyond the Free plan's 5 GB limit — paid plans have unlimited storage. It does not charge for video or voice calls, screen sharing, or canvas collaboration features.

Comparing Slack to other team communication tools

Slack's pricing is higher than some alternatives. Microsoft Teams, which integrates with Microsoft 365, costs $6 per user per month (Teams Essentials) or is included free with Microsoft 365 subscriptions. Discord is free for unlimited users and channels, though it is designed more for communities than workplaces. Mattermost and Rocket.Chat are open-source alternatives that you can host yourself, which eliminates per-user fees but requires technical setup and maintenance.

The choice depends on what your team needs. Slack's strength is search, integrations, and workflow automation — features that justify the cost for teams that rely on searchable message history and need to connect many tools. Teams is cheaper if you already use Microsoft 365. Discord is free but lacks business features like compliance and audit logs. Open-source tools are free but require someone to manage the server.

For most small to medium teams that need a professional communication platform with good search and integrations, Pro or Business+ is the realistic cost. Free workspaces are useful for trials or very small groups, but the 90-message limit becomes a real problem quickly.

Frequently Asked Questions

Do I have to pay for inactive users or people I invite but who never log in?

No. Slack counts only active users — people who have logged in and interacted with the workspace at least once during the billing month. If you invite someone and they never log in, or if you remove someone, you do not pay for that seat. This makes it easy to experiment with adding team members without worrying about extra charges.

Can I switch between monthly and annual billing?

Yes. You can change your billing frequency in the workspace settings under Billing. If you switch from monthly to annual, Slack prorates the difference and applies any credit to your new annual charge. If you switch from annual to monthly, you lose the discount for the remainder of the year, but the change takes effect on your next billing date.

What happens to my data if I stop paying?

Your workspace downgrades to Free if payment fails, or you have 30 days to download your data if you cancel intentionally. After 30 days, the workspace is permanently deleted. During the grace period, you can still view all messages and files but cannot post or make changes.

Is there a discount if I commit to multiple years?

Slack offers a discount for annual billing compared to month-to-month, but not for multi-year commitments on Pro or Business+. Enterprise Grid customers can negotiate longer contracts, which may include volume or term discounts, but you have to contact sales to explore that option.

Do I pay extra for video calls, file storage, or integrations?

No. Video and voice calls, unlimited file storage (on paid plans), and integrations are included in your subscription cost. Some apps in the Slack App Marketplace charge their own fees, but Slack's core features do not have hidden add-ons.