# Mattermost vs Slack

**Leader by vioscaleAI score:** Slack

| Attribute | Mattermost | Slack |
|---|---|---|
| **vioscaleAI score** | 67 (65% (medium)) | 78.7 (51% (medium)) |
| activity.commits_last_30d | 100 | - |
| adoption.dependent_repos | 371 | - |
| adoption.github_stars | 39,264 | - |
| content.faq | `[{"answer":"Mattermost is a self-hosted or cloud-based collaboration platform offering secure messaging, voice calling, screen sharing, workflow automation, and AI-assisted tools for teams and enterprises. It is indexed under Collaboration Software.","source":"https://mattermost.com","question":"What is Mattermost?","confidence":0.6},{"answer":"Mattermost offers a free tier, so you can start without paying. Paid plans are also available: Open Source, Enterprise E10 and Enterprise E20. Pricing changes often, so verify at source before relying on it.","source":"https://mattermost.com","question":"Is Mattermost free?","confidence":0.6},{"answer":"Mattermost supports the web, Windows, macOS, Linux, iOS, Android and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://mattermost.com","question":"What platforms does Mattermost support?","confidence":0.6},{"answer":"Yes. Mattermost can be deployed cloud / SaaS, hybrid, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://mattermost.com","question":"Can Mattermost be self-hosted?","confidence":0.6},{"answer":"We have confirmed 14 integrations for Mattermost, including Slack, Git, Jenkins, Twitter, Bugzilla, RSS, Gerrit and Redmine, plus 6 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://mattermost.com","question":"What does Mattermost integrate with?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Mattermost. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Mattermost not holding them. Always confirm compliance directly before you rely on it.","source":"https://mattermost.com/security","question":"What security certifications does Mattermost have?","confidence":0.7},{"answer":"Mattermost is available worldwide. Its primary markets are the United States, Canada, the United Kingdom, the EU and Japan. The vendor is headquartered in the United States.","source":"https://mattermost.com","question":"Where is Mattermost available?","confidence":0.75}]` | `[{"answer":"A work operating system that combines messaging, workflow automation, and app integrations to enable team communication, process documentation, and knowledge sharing with enterprise security. It is indexed under Collaboration Software.","source":"https://slack.com","question":"What is Slack?","confidence":0.6},{"answer":"Slack offers a free tier, so you can start without paying. Paid plans start at £5.75 per user per month. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://slack.com","question":"Is Slack free?","confidence":0.6},{"answer":"Slack supports the web and iOS. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://slack.com","question":"What platforms does Slack support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Slack, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://slack.com","question":"Can Slack be self-hosted?","confidence":0.6},{"answer":"We have confirmed 15 integrations for Slack, including Salesforce, Atlassian, Lucid, Loom, Miro, Smartsheet, Mural and Zapier, plus 7 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://slack.com","question":"What does Slack integrate with?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Slack. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Slack not holding them. Always confirm compliance directly before you rely on it.","source":"https://slack.com/security","question":"What security certifications does Slack have?","confidence":0.7}]` |
| deployment.options | `{"cloud":true,"on_prem":true,"air_gapped":true,"self_hosted":true}` | `{"cloud":true}` |
| description.long | Mattermost is a self-hosted or cloud-based collaboration platform offering secure messaging, voice calling, screen sharing, workflow automation, and AI-assisted tools for teams and enterprises. | Slack is a cloud-based system that enables teams to communicate through channels, integrate with external tools, and automate workflows while maintaining enterprise-grade security and compliance controls. |
| features.capabilities | `{"hosting":"both","sso_scim":true,"free_tier":true,"messaging":true,"api_access":true,"whiteboard":false,"pricing_model":"per_seat_subscription","screen_sharing":true,"video_meetings":false,"app_marketplace":true,"deployment_model":"self_hosted_on_premise","compliance_controls":true,"guest_external_access":true,"recording_transcription":"recording_ai_notes","cross_company_guest_channels":true,"threaded_reply_conversations":true,"automated_workflow_bot_builders":true,"channel_based_topic_organization":true,"jira_github_engineering_webhook_sync":true,"robust_message_search_and_history_indexing":true}` | `{"hosting":"cloud","sso_scim":true,"messaging":true,"api_access":true,"video_meetings":true,"app_marketplace":true,"deployment_model":"cloud_saas","compliance_controls":true,"guest_external_access":true,"recording_transcription":"recording_ai_notes","threaded_reply_conversations":true,"automated_workflow_bot_builders":true,"channel_based_topic_organization":true,"robust_message_search_and_history_indexing":true}` |
| integrations.count | 700 | 2,500 |
| integrations.list | `[{"name":"Slack"},{"name":"Git"},{"name":"Jenkins"},{"name":"GitLab"},{"name":"GitHub"},{"name":"Twitter"},{"name":"Bugzilla"},{"name":"RSS"},{"name":"Gerrit"},{"name":"Redmine"},{"name":"Mercurial"},{"name":"SVN"},{"name":"Threema"},{"name":"Pexip"},{"name":"Prometheus","category":"monitoring","direction":"inbound"},{"name":"Grafana","category":"monitoring","direction":"inbound"},{"name":"Microsoft Teams","native":true,"category":"chat","direction":"bidirectional"},{"name":"Matrix","native":false,"category":"chat","direction":"bidirectional"},{"name":"XMPP","native":false,"category":"chat","direction":"bidirectional"},{"name":"Trello","native":true,"category":"project_management","direction":"outbound"},{"name":"ServiceNow","native":true,"category":"itsm","direction":"bidirectional"},{"name":"PagerDuty","native":true,"category":"incident_response","direction":"bidirectional"},{"name":"Splunk","native":true,"category":"monitoring","direction":"bidirectional"},{"name":"Nagios","native":true,"category":"monitoring","direction":"bidirectional"},{"name":"Ansible","native":true,"category":"automation","direction":"outbound"},{"name":"Matterbridge","native":false,"category":"chat","direction":"bidirectional"}]` | `[{"name":"Salesforce"},{"name":"Atlassian"},{"name":"Lucid"},{"name":"Loom"},{"name":"Miro"},{"name":"Smartsheet"},{"name":"Mural"},{"name":"Zapier"},{"name":"Microsoft 365","native":true},{"name":"Jira","native":true,"category":"project_management"},{"name":"GitHub","native":true,"category":"engineering"},{"name":"Google Workspace","native":true,"category":"authentication","direction":"inbound"},{"name":"Okta","native":true,"category":"authentication","direction":"inbound"},{"name":"ADFS","native":true,"category":"authentication","direction":"inbound"},{"name":"Zendesk","native":true}]` |
| language.primary | TypeScript | - |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"ios":true,"mac":true,"web":true,"linux":true,"android":true,"windows":true}` | `{"ios":true,"web":true}` |
| pricing | `{"type":"hybrid","plans":[{"free":false,"name":"Enterprise Edition E10","contactSales":false},{"free":false,"name":"Enterprise Edition E20","contactSales":false}],"freeTier":true,"sourceUrl":"https://mattermost.com","retrievedAt":"2026-10-05T11:08:02.475Z"}` | `{"type":"subscription","plans":[{"free":true,"name":"Free","summary":"Free forever","features":["90 days of message history","Up to 10 apps from Slack App Directory","1:1 audio and video meetings with screen sharing","1:1 external messages via Slack Connect","SAML-based single sign-on","SCIM user management","EMM integration support","Native data loss prevention","AI conversation summaries","Slackbot personal AI agent","AI workflow generation","AI search","AI daily recaps","AI file summaries"],"components":[{"kind":"fixed","amount":0,"period":"month","currency":"GBP"}],"description":"A simpler way to chat and collaborate","contactSales":false,"includedLimits":{"apps":"up to 10","message_history":"90 days"}},{"free":false,"name":"Pro","summary":"£7/user/month (£5.75/user/month billed annually)","features":["Unlimited message history","Unlimited app integrations","2,600+ apps in Slack App Directory"],"components":[{"kind":"per_unit","unit":"user","amount":7,"period":"month","currency":"GBP"},{"kind":"per_unit","unit":"user","amount":5.75,"period":"month","currency":"GBP"}],"description":"Drive productivity in one place","contactSales":false}],"summary":"From £0 (free tier) to £7/user/month (Pro). Free tier available.","currency":"GBP","freeTier":true,"sourceUrl":"https://slack.com","retrievedAt":"2026-08-05T14:23:07.180Z","startingPrice":{"amount":5.75,"period":"month","currency":"GBP"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | commercial |
| pricing.price_level | low | low |
| pricing.transparent | no | yes |
| release.cadence_days | 1 | - |
| release.history | `[{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.10.3-rc1","date":"2026-10-02T11:23:57Z","type":"prerelease","version":"v11.10.3-rc1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v12.0.0-rc2","date":"2026-09-25T08:37:30Z","type":"prerelease","version":"v12.0.0-rc2"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.11.1","date":"2026-09-24T06:27:30Z","type":"stable","version":"v11.11.1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v12.0.0-rc1","date":"2026-09-18T10:58:45Z","type":"prerelease","version":"v12.0.0-rc1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v10.11.24","date":"2026-09-16T09:55:00Z","type":"stable","version":"v10.11.24"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.10.2","date":"2026-09-15T07:48:24Z","type":"stable","version":"v11.10.2"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.7.11","date":"2026-09-15T05:06:55Z","type":"stable","version":"v11.7.11"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.7.11-rc1","date":"2026-09-11T12:06:09Z","type":"prerelease","version":"v11.7.11-rc1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.9.2","date":"2026-09-15T06:26:10Z","type":"stable","version":"v11.9.2"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.11.0","date":"2026-09-07T11:26:50Z","type":"stable","version":"v11.11.0"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.11.0-rc3","date":"2026-09-07T10:37:02Z","type":"prerelease","version":"v11.11.0-rc3"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.7.10","date":"2026-08-26T11:53:54Z","type":"stable","version":"v11.7.10"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.11.0-rc2","date":"2026-08-25T09:15:51Z","type":"prerelease","version":"v11.11.0-rc2"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.10.1","date":"2026-08-24T07:07:00Z","type":"stable","version":"v11.10.1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.11.0-rc1","date":"2026-08-18T06:47:33Z","type":"prerelease","version":"v11.11.0-rc1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.7.9","date":"2026-08-13T06:29:32Z","type":"stable","version":"v11.7.9"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.9.1","date":"2026-08-13T06:07:31Z","type":"stable","version":"v11.9.1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.9.1-rc1","date":"2026-08-07T09:17:30Z","type":"prerelease","version":"v11.9.1-rc1"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.8.5","date":"2026-08-13T05:45:21Z","type":"stable","version":"v11.8.5"},{"url":"https://github.com/mattermost/mattermost/releases/tag/v11.8.5-rc1","date":"2026-08-07T08:38:34Z","type":"prerelease","version":"v11.8.5-rc1"}]` | - |
| reliability.status_page | yes | yes |
| security.certifications | `[{"name":"Section 508 Compliance","status":"active","evidenceUrl":"https://mattermost.com"}]` | - |
| security.disclosure_policy | yes | yes |
| security.gdpr | yes | yes |
| security.scorecard | 7.3 | - |
| security.trust_center | https://mattermost.com/blog/trusted-device-authentication-101/ | https://slack.com/blog/collaboration/security-at-slack-how-slack-protects-your-data |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=mattermost-redux&per_page=100","last_12m":0,"max_severity":null}` | - |

## Capabilities (Collaboration Software)

| Capability | Mattermost | Slack |
|---|:--:|:--:|
| **Modality** |  |  |
| Messaging | ✓ | ✓ |
| Video meetings | ✗ | ✓ |
| Whiteboard | ✗ | - |
| **Meetings** |  |  |
| Screen sharing | ✓ | - |
| Recording / transcription | Recording + AI notes | Recording + AI notes |
| **Security** |  |  |
| End-to-end encryption | - | - |
| SSO / SCIM | ✓ | ✓ |
| **Access** |  |  |
| Guest / external access | ✓ | ✓ |
| **Compliance** |  |  |
| Compliance controls | ✓ | ✓ |
| **Deployment** |  |  |
| Hosting | Cloud + self-hosted | Cloud only |
| **Scale** |  |  |
| Max participants | - | - |
| **Ecosystem** |  |  |
| App marketplace | ✓ | ✓ |
| Public API / bot framework | ✓ | ✓ |
| **Commercial** |  |  |
| Free tier | ✓ | - |

*Source: vioscaleAI. Generated 2026-10-16T21:41:37.457Z. "-" = undocumented, not absent.*