// comparison
Slack Pro vs. Mattermost Professional
pricing checked June 2026
Cheaper start
$9/mo
Business team chat with admin controls
- Best for: Business teams needing governance
- Model: per-seat
Compare
$10/mo
Self-hostable team chat
- Best for: Teams needing on-prem chat
- Model: per-seat
Pricing math
Slack Pro is 13% cheaper than Mattermost Professional on starting plans — roughly $1/mo · $15/yr per seat.
Formula: monthly = pricier − cheaper · percent = round((monthly / pricier) × 100) · annual = monthly × 12
Verdict
Pick Slack Pro if you're business teams needing governance. Pick Mattermost Professional if you're teams needing on-prem chat.
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Caveats
- Slack Pro: Per-user cost adds up
- Mattermost Professional: Self-hosting requires ops effort
More comparisons
Other ways to swap Slack Pro or Mattermost Professional.
Prices change often — verify on the vendor's site before switching.