Quick Answer
Last verified:
Medium confidence

Slack costs Free to $15 per user/month as of July 2026, with 4 plans available including a free tier. Plans: Free (free), Pro at $7.25/user/month, and Business+ at $15/user/month. Enterprise pricing is available on request. Pricing depends on your chosen tier, contract length, and negotiated discounts.

Use the interactive pricing calculator to estimate your exact cost based on team size and requirements.

  • Free tier: Yes

Slack offers 4 pricing tiers: Free, Pro, Business+, Enterprise+. A free plan is available. Paid plans include Pro at $7.25/user/month, Business+ at $15/user/month. The Pro plan is growing teams that need full message history.

Last verified: | Sources: 1 pricing pages and reviews
Know Before You Buy — Try Slack Free

Slack lists $0-$15/user/month, but hidden costs like implementation and support add to the total as of July 2026. Key hidden costs: sso/saml requires enterprise plan, unexpected workspace-wide billing on upgrade, no refunds on cancelled or unused subscriptions. Verified from 1 sources by CostBench.

Hidden Costs Breakdown

1

SSO/SAML Requires Enterprise Plan

high addon

Single Sign-On (SAML) is locked behind the Enterprise Grid plan, forcing companies using Okta, Ping, or other identity providers to pay significantly more. This nearly doubles the per-user cost compared to mid-tier plans.

hn

Almost doubles in price to get SAML. $5.83 /user/mo increase.

hn

Asana and Slack will not let you SAML from Okta unless you upgrade to their most expensive tier, but Google SSO is always free.

2

Unexpected Workspace-Wide Billing on Upgrade

critical overage

Users report that upgrading to a paid plan affects all members in the workspace, not just the individual user. One reviewer was charged for 60 users when they intended to upgrade only their own account, resulting in $500/month charges.

trustpilot

The fee on the screen said $7 per user. I am the only user I have control over, so I was expecting a $7 charge. Nope. I upgraded the entire group of 60 people. I got charged $500 a month twice before I noticed the charges.

3

No Refunds on Cancelled or Unused Subscriptions

high compliance

Multiple users report that Slack does not issue refunds when subscriptions are cancelled, even immediately after renewal. Credits are issued instead of refunds, and those credits can only be used by resubscribing.

trustpilot

Cancelled the subscription the same day as renewal, they stop the pro featured right away even if I already paid for the month, kept the money and give me back £7 in Slack credit.

trustpilot

I cancelled my Slack membership as I have not used the tool for a long time now, and the only way to get any benefit from the credits is by resubscribing to their services. Their policies do not allow refunds to the method of billing or transfers to other accounts.

4

Slack AI Add-On Costs

medium addon

Slack AI (channel summaries, search summaries) is a paid add-on on top of the base subscription. Users who trialed the 30-day Slack AI feature found the add-on too expensive to continue after the trial ended.

hn

After my 30-day trial on Slack AI ran out I decided to build my own version: Catch Up. I really enjoyed the ability to make summaries of channels to catch up on the latest activities. The reason for building my own was because of Slacks AI pricing being so expensive.

5

Per-User Pricing Scales Steeply for Growing Teams

high overage

Slack's per-user pricing model becomes expensive as teams grow, prompting many organizations to migrate to bundled alternatives like Microsoft Teams (included in Office 365). Nonprofits and early-stage startups frequently cite Slack pricing as prohibitive.

hn

Slack's pricing model is way too expensive and their 1:6 Paid-to-Unpaid user ratio is evidence of that.

hn

A nonprofit I help out just moved from Slack to Discord for a very simple reason: Slack pricing was too expensive, and as the amount of people increased, the price continues to climb.

6

Sales Contract Lock-In and Auto-Renewal

high compliance

Users report being locked into multi-year contracts by the Slack Sales team with renewal terms that are difficult to exit. One reviewer describes being 'conned into signing a contract' with unfavorable terms.

trustpilot

We are a small commercial company who got conned into signing a contract for the SLACK Platform by the Slack Sales Force Team. We realized this just after signing the contract when the sales team rene...

reddit

Salesforce are the worst. Slack had such a good model for pricing - why destroy it?

7

Poor Support Quality Across All Tiers

medium support

Multiple users report non-existent or extremely slow support responses on both free and paid plans, including the Business+ plan. Ticket delays of 7+ days are common on free plans; paid plan users report 2-3 day delays and unresolved critical bugs.

trustpilot

In both cases the experience was quite bad. Free: non-existent! Tickets are open for +7 days and reply despite follow ups. Paid: After 2-3 days you get a...

trustpilot

We're using the Business+ plan for 30 people, and we've asked for help through multiple emails, but they don't seem to care.

Frequently Asked Questions

01 What hidden costs should I budget for with Slack?

Beyond the license fee, budget for: SSO/SAML Requires Enterprise Plan ($7-15/user/month); Unexpected Workspace-Wide Billing on Upgrade ($7.25-15/user/month for all workspace members); No Refunds on Cancelled or Unused Subscriptions (100% of prepaid subscription cost lost); Slack AI Add-On Costs (10-25% of license costs); Per-User Pricing Scales Steeply for Growing Teams ($7.25-15/user/month × all active users); Sales Contract Lock-In and Auto-Renewal (12+ months of subscription at full price); Poor Support Quality Across All Tiers (5-15% of license costs). Exact totals depend on your deployment size and negotiated terms.

02 Does Slack charge for implementation?

Implementation costs for Slack vary by deployment size and customization. Contact the vendor or check our sourced hidden-cost breakdown above for verified figures.

03 How much does Slack support cost?

Multiple users report non-existent or extremely slow support responses on both free and paid plans, including the Business+ plan. Ticket delays of 7+ days are common on free plans; paid plan users report 2-3 day delays and unresolved critical bugs. Estimated impact: 5-15% of license costs.

04 Are there overage or storage costs with Slack?

Users report that upgrading to a paid plan affects all members in the workspace, not just the individual user. One reviewer was charged for 60 users when they intended to upgrade only their own account, resulting in $500/month charges. Estimated impact: $7.25-15/user/month for all workspace members.

05 What add-ons cost extra with Slack?

Add-on pricing for Slack varies by feature. The sourced cost breakdown above lists any verified add-on costs we have.

Now You Know the Real Cost — Try Slack Free

Check current Slack pricing

Prices and terms change; verify against the live pricing page.

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