Mattermost vs Slack
What each one’s own pages state, side by side. Every value is a quote AirStack found on that product’s pages; “Not observed” means AirStack has not found it on that product’s pages.
| Mattermost | Slack | |
|---|---|---|
| What it says it does | Zero-trust collaboration, automation and AI in private cloud, self-hosted, and air-gapped environments. mattermost.com | Slack | AI Work Platform & Productivity Tools slack.com |
| Starting at | Not observed | $4.38 USD Pro · per user / month free plan listed |
| Platforms | desktop, embedded inside Microsoft Teams, mobile, web, Android, Mac, PC, iOS mattermost.com | Not observed |
| Deployment | fully air-gapped, private cloud, self-hosted, cloud-based hyperscalers, on-prem data centers mattermost.com | Not observed |
| Integrations | Matrix, Microsoft Teams, XMPP, GitHub, Jira, ServiceNow, Global Relay, Proofpoint, GitLab, Zoom, Grafana, Prometheus, Pexip, Elasticsearch, Actiance, Amazon EKS, Azure Kubernetes Service, DigitalOcean Kubernetes, Google Kubernetes Engine, CircleCI, Confluence, GitLab Plugin, Jira Plugin, Zoom Plugin, BotKube, Cisco Syslog, Nagios, Sentry, Prometheus AlertManager Plugin, Chess Plugin mattermost.com | Asana, Box, ChatGPT, Google Drive, Vercel, Workday, Jira, Salesforce, Claude slack.com |
| Compliance | CCPA, GDPR, ISO 27001, SOC 2 trust.mattermost.com | CCPA, GDPR, HIPAA slack.com |
| Free plan | Yes mattermost.com | Yes slack.com |
| Plans | Enterprise, Enterprise Advanced, Professional mattermost.com | Free, Pro, Business+, Enterprise+ slack.com |
| Open source | Yes mattermost.com | Not observed |
| Pricing basis | Not observed | per user / month, when paying monthly slack.com |
Where they differ
- Mattermost’s pages state that it is open source; AirStack has not found that on Slack’s pages.
- Slack claims HIPAA on its own pages; Mattermost’s pages read by AirStack do not mention it.
- Mattermost claims ISO 27001 on its own pages; Slack’s pages read by AirStack do not mention it.
- Mattermost claims SOC 2 on its own pages; Slack’s pages read by AirStack do not mention it.
Prices are list prices as written on each pricing page; check them before you buy. Nothing here is a ranking or a recommendation.