True cost comparison — not just what the pricing page says
Quick Verdict
Slack saves you 100%
Best for Slack
Payroll, benefits, and HR platform for small businesses. Base at $40/mo + $6/person/mo, but benefits
Best for Gusto
Team messaging and collaboration hub. Free plan has a 90-day message history limit that forces upgra
Team messaging and collaboration hub. Free plan has a 90-day message history lim...
Advertised
$0
/month
True Cost
$8
/month (typical)
90-Day Message History Limit
Free plan deletes message access after 90 days. Your team's entire knowledge base disappears quarter...
Per-User Cost at Scale
A 100-person company on Pro pays $875/mo ($10,500/yr). Business+ is $1,250/mo ($15,000/yr). The per-...
Slack Connect External Channels
Connecting with external organizations requires Pro ($8.75/user/mo) minimum. Free plan has no extern...
$7/mo annual
Payroll, benefits, and HR platform for small businesses. Base at $40/mo + $6/per...
Advertised
$40
/month
True Cost
$136
/month (typical)
Per-Person Fee Scaling
Simple plan: $40/mo + $6/person. Plus: $80/mo + $12/person. Premium: $180/mo + $22/person. A 25-pers...
Benefits Administration Add-On
Health insurance, 401(k), and benefits administration are not included in Simple. Plus plan ($80/mo ...
State Tax Registration Fees
Registering for state taxes in new states costs $35-$100 per state as a one-time fee. Multi-state re...
Gusto advertises $40/mo. Slack advertises $0/mo.
Gusto has 3 documented hidden fees. Slack has 3.
Gusto confidence: 76%. Slack confidence: 83%.
| Metric | Slack | Gusto | Winner |
|---|---|---|---|
| Advertised Price | $0/mo | $40/mo | Slack |
| True Monthly Cost | $8/mo | $136/mo | Slack |
| Hidden Fee Total | +$8/mo | +$96/mo | Slack |
| # Hidden Fees | 3 | 3 | Slack |
| Confidence Score | 83% | 76% | Slack |
| Pricing Tiers | 4 | 3 | — |
| Affiliate Program | No public affiliate program | None | — |
Slack advertises $0/mo and Gusto advertises $40/mo. However, when you include hidden fees, Slack has 3 documented hidden fees adding +$8/mo, while Gusto has 3 hidden fees adding +$96/mo. Based on true cost, Slack is typically 100% cheaper.
Slack has 3 documented hidden fees: 90-Day Message History Limit, Per-User Cost at Scale, Slack Connect External Channels. These add approximately +$8/mo on top of the $0/mo advertised price.
Gusto has 3 documented hidden fees: Per-Person Fee Scaling, Benefits Administration Add-On, State Tax Registration Fees. These add approximately +$96/mo on top of the $40/mo advertised price.
Choose Slack if: Payroll, benefits, and HR platform for small businesses. Base at $40/mo + $6/person/mo, but benefits. Choose Gusto if: Team messaging and collaboration hub. Free plan has a 90-day message history limit that forces upgra. The right choice depends on your team size, usage volume, and which features you need most.
This comparison is based on manual research of official pricing pages, terms of service, and user reports. Slack data has a 83% confidence score and Gusto has 76%. Prices were last verified in April 2026. For the most accurate estimate, enter your specific usage in our calculator.
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