Slack is an alternative
to Mattermost
$0/mo (Free) vs Mattermost at — — covering 56% of the 9 compared capabilities.
Same job. Way less money.
Comparison scenario
Every cheaper-than claim is tied to a defined scenario — never a bare list price.
10 seats, monthly billing · USD · prices as observed on official pricing pages.
plan at —, the cheapest paid plan.
Free: 0 USD/monthly.
We list 1 assessed alternative; Mattermost's own price is not verified yet, so no cheaper-than claim is made.
Capability comparison
Slack covers 56% of the 9 capabilities compared against Mattermost. ✓ native · ◐ via integration · ✗ not found.
| Capability | Slack | Mattermost |
|---|---|---|
| Channels & group messaging | ✓ | ✓ |
| Threaded conversations | ✓ | ✓ |
| Guest & external collaboration | ✓ | ✓ |
| SAML single sign-on | ↑ Business+ | ✓ |
| Self-hosted deployment | ✗ | ✓ |
| Compliance exports & audit logs | ↑ Business+ | ✓ |
| AI search & summaries | ✓ | ✓ |
| App integrations | ✓ | ✓ |
| Workflow automation | ↑ Pro | ✓ |
What you give up
Capabilities Mattermost has that Slack lacks.
- SAML single sign-on — Sign in through your company's SAML single sign-on.Missing from Slack.
- Self-hosted deployment — Run the chat platform on your own infrastructure.Missing from Slack.
- Compliance exports & audit logs — Export message history and audit logs for compliance.Missing from Slack.
- Workflow automation — Automate routine steps directly within chat.Missing from Slack.
Price at your volume
The same comparison recomputed at three sizes. Plan caps change who is cheapest.
| Usage | Mattermost | Slack |
|---|---|---|
| 3 seats | — | $0/moFree |
| 10 seats | — | $0/moFree |
| 25 seats | — | $0/moFree |
Plans & pricing, side by side
Advertised prices in USD as observed on the official pricing pages — per-seat and transaction-fee plans are marked.
| Free | Free |
| Pro | $8.75/seat/mo |
| Business+ | $18/seat/mo |
| Enterprise+ | Contact sales |
| Entry | Free |
| Professional | Contact sales |
| Enterprise | Contact sales |
| Enterprise Advanced | Contact sales |
Frequently asked
What does Slack lack compared with Mattermost?
SAML single sign-on, Self-hosted deployment, Compliance exports & audit logs, Workflow automation — 4 of the 9 compared capabilities.
When were these prices checked?
Mattermost: 2026-10-26; Slack: 2026-10-26 — on the official pricing pages.
Who switched
Anonymous: no account, no email, no IP stored. Reports are shown once a switch has 3 or more and never change ranking or order — alternatives are computed from prices and capabilities only.
Sources & freshness
- https://mattermost.com/pricing/ (official_pricing, checked 2026-10-26)
- https://mattermost.com/pricing/#skip-nav-target (official_pricing, checked 2026-10-26)
- Slack data last verified 2026-10-26