# Slack Pro vs Mattermost Team Edition (2026): Free Alternative to Slack Pro

Canonical: https://caniforkit.com/vs/slack-pro-vs-mattermost-team-edition
Last updated: 2026-08-10

Compare Slack Pro ($8.75/mo) vs Mattermost Team Edition ($0/mo open source MIT alternative to Slack Pro). Side-by-side breakdown of pricing, self-hosting setup, data storage, and practical trade-offs.

## Side-by-Side Comparison Matrix

| Feature / Metric | Slack Pro | Mattermost Team Edition |
| --- | --- | --- |
| Monthly Subscription | $8.75/mo | $0.00 / month |
| 1-Seat Annual Cost | $105/yr | $0.00 / year |
| 5-Person Team Annual Cost | $525/yr | $0.00 / year |
| 10-Person Team Annual Cost | $1,050/yr | $0.00 / year |
| License Model | Proprietary Commercial SaaS | MIT |
| Hosting / Runtime | Vendor Cloud | Self-host |
| Data Ownership | Stored on vendor servers | Channels, posts, users, and configuration live in PostgreSQL; file attachments live in the Mattermost data directory or configured S3-compatible object storage. |
| GitHub Stars | Closed Source | ★ 39k |
| Code Repository | None | https://github.com/mattermost/mattermost |
| The Catch / Trade-off | Recurring subscription cost | Mattermost Team Edition closely resembles Slack, but self-hosting adds database, email, storage, backup, upgrade, and uptime work while enterprise identity and compliance remain paid. |

## About Mattermost Team Edition
Slack-shaped chat below 250 users, self-hosted; the subscription disappears and the pager appears.

- **Installation**: Install the official Linux binary with PostgreSQL, then configure systemd, TLS/reverse proxy, SMTP, and file storage
- **Setup Notes**: The first obstacle is a real Linux service deployment, PostgreSQL, SMTP, DNS/TLS, storage, backups, and upgrades, not an app-store install.
- **Data Storage**: Channels, posts, users, and configuration live in PostgreSQL; file attachments live in the Mattermost data directory or configured S3-compatible object storage.
- **Supported Platforms**: desktop, mobile, web, self-hosted, self-host, real ops
- **The Catch vs Slack Pro**: Mattermost Team Edition closely resembles Slack, but self-hosting adds database, email, storage, backup, upgrade, and uptime work while enterprise identity and compliance remain paid.

## Cost Savings Breakdown
Switching from Slack Pro to Mattermost Team Edition eliminates ongoing per-seat subscriptions:
- **Solo / 1-seat**: Save **$105/year**
- **5-person team**: Save **$525/year**
- **10-person team**: Save **$1,050/year**

## Frequently Asked Questions

### Is Mattermost Team Edition a good free alternative to Slack Pro?
Yes. Mattermost Team Edition is a verified open source (MIT) replacement for Slack Pro. Slack-shaped chat below 250 users, self-hosted; the subscription disappears and the pager appears.

### What is the catch when switching from Slack Pro to Mattermost Team Edition?
Mattermost Team Edition closely resembles Slack, but self-hosting adds database, email, storage, backup, upgrade, and uptime work while enterprise identity and compliance remain paid.

## Related

- [All Slack Pro Alternatives](https://caniforkit.com/slack-pro)
- [Mattermost Team Edition Full Profile](https://caniforkit.com/fork/mattermost-team-edition)
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- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)