Slack advertises $0/month. Counting its 3 documented recurring fees, an illustrative monthly estimate is $8/month. This data has not yet been compared with the vendor's pricing page, so confirm current prices before buying. Vendor pricing page (slack.com).
Team messaging and collaboration hub. Free plan has a 90-day message history limit that forces upgrades. Per-user pricing adds up fast for growing teams.
Advertised Price
$0
/month
Estimated Monthly Cost
$8
/month (illustrative scenario)
Vs. Advertised
—
no comparable advertised price
Pricing Data
Pricing check date not recorded
Prices change often — confirm on the vendor's site before buying.
What the pricing page doesn't tell you
Free plan deletes message access after 90 days. Your team's entire knowledge base disappears quarterly. Upgrading to Pro to keep history costs $8.75/user/mo.
Trigger: messageAge > 90
+$0/mo
A 100-person company on Pro pays $875/mo ($10,500/yr). Business+ is $1,250/mo ($15,000/yr). The per-user model makes Slack one of the most expensive line items for growing companies.
Trigger: users > 50
+$0/mo
Connecting with external organizations requires Pro ($8.75/user/mo) minimum. Free plan has no external channel support. Each external org connection counts toward channel limits.
Trigger: externalOrgs > 0
+$8/mo
| Plan | Monthly | Annual (per mo) | Key Limits | Overage Rules |
|---|---|---|---|---|
Free | $0 | $0 |
| No overages |
ProPOPULAR per user | $9 | $7 |
| No overages |
Business+ per user | $13 | $13 |
| No overages |
Enterprise Grid per user | $0 | $0 |
| No overages |
Slack's free plan now limits message history to 90 days (previously 10K messages). Pro at $8.75/user/mo and Business+ at $12.50/user/mo seem fair until you multiply by headcount. A 50-person team on Pro = $437.50/mo. Plus, Slack Connect, Huddles, and workflow automations have their own limits.
Slackoffers a free plan, but with significant restrictions. Here's exactly what you get — and what forces you to upgrade.
⚠️ When you'll need to upgrade:
Most teams outgrow the free plan within 1-3 months. The first paid tier (Pro) costs $9/mo.
⚠️ When you'll need to upgrade:
Most teams outgrow the free plan within 1-3 months. The first paid tier (Pro) costs $9/mo.
Slackcharges per user. Here's what your team will actually pay at different sizes.
| Team Size | Pro | Business+ |
|---|---|---|
| 1 user | $8.75/mo | $12.5/mo |
| 3 users | $26.25/mo | $37.5/mo |
| 5 users | $43.75/mo | $62.5/mo |
| 10 users | $87.5/mo | $125/mo |
| 25 users | $218.75/mo | $312.5/mo |
| 50 users | $437.5/mo | $625/mo |
Compare cheaper options in Project Management ranked by true cost, not advertised price.
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