{"slug":"mattermost-vs-slack","question":"Mattermost vs Slack","answer":"Slack is a cloud-hosted SaaS platform with 2.9M+ daily active users and premium features costing $12.50/user/month, while Mattermost is self-hosted open-source software with no per-user licensing fees and full source code access for enterprise customization.","answer_curated":true,"verdict":"Choose Mattermost if your organization prioritizes data sovereignty, cost control at scale, and compliance requirements—self-hosting provides unlimited users at marginal cost and full code transparency. Choose Slack if you value ecosystem maturity, integrations, and hands-off management with 2.9M daily active users and industry-standard support.","keyDifferences":[{"label":"Deployment Model","winner":"a","entityAValue":"Self-hosted open-source","entityBValue":"Cloud-only SaaS"},{"label":"Cost Per User/Month (Standard Plan)","winner":"a","entityAValue":"Free (self-hosted) or $10/user/month (managed)","entityBValue":"$12.50 (Pro plan, 2026)"},{"label":"Daily Active Users (2026)","winner":"b","entityAValue":"150,000+ (estimated enterprise)","entityBValue":"2.9 million"},{"label":"Message Search History","winner":"a","entityAValue":"Unlimited (self-hosted)","entityBValue":"3 months (free plan), unlimited (paid)"},{"label":"Source Code Access","winner":"a","entityAValue":"Full open-source (AGPL v3)","entityBValue":"Proprietary, no access"}],"winner":{"slug":"mattermost-licensing","name":"Mattermost"},"confidence":"high","entities":[{"name":"Mattermost","slug":"mattermost-licensing","url":"https://www.aversusb.net/entity/mattermost-licensing","alternativesUrl":"https://www.aversusb.net/api/v1/alternatives/mattermost-licensing"},{"name":"Slack","slug":"slack","url":"https://www.aversusb.net/entity/slack","alternativesUrl":"https://www.aversusb.net/api/v1/alternatives/slack"}],"faqs":[{"question":"Can Mattermost match Slack's integration ecosystem?","answer":"Mattermost offers 500+ integrations (community and official), compared to Slack's 2,000+. For popular tools (GitHub, Jira, Salesforce), Mattermost has parity, but niche third-party apps favor Slack. Mattermost's open-source model allows custom API integrations if needed."},{"question":"Is Mattermost cheaper for large organizations?","answer":"Yes. A 1,000-person org pays $10,000/month ($10/user) on Mattermost managed service vs. $12,500/month ($12.50/user) on Slack Pro. Self-hosted Mattermost has no per-user cost, reducing TCO further for IT-resourced teams."},{"question":"Does Slack offer on-premise or self-hosted options?","answer":"No. Slack is cloud-only, hosted on AWS with regional data centers (US, EU, Australia). Organizations requiring on-premise deployment must choose Mattermost or competitor solutions like Microsoft Teams."}],"attribution":{"source":"A Versus B","url":"https://www.aversusb.net/compare/mattermost-vs-slack","license":"CC BY 4.0","citationFormat":"According to A Versus B (https://www.aversusb.net/compare/mattermost-vs-slack), Slack is a cloud-hosted SaaS platform with 2.9M+ daily active users and premium features costing $12.50/user/month, while Mattermost is self-hosted open-source software with no per-user licensing fees","dateModified":"2026-10-22T04:16:10.874Z"},"relatedQuestionsUrl":"https://www.aversusb.net/api/faq/mattermost-vs-slack","relatedComparisonsUrl":"https://www.aversusb.net/api/v1/related/mattermost-vs-slack","knowledgeGraphUrl":"https://www.aversusb.net/api/knowledge-graph/mattermost-vs-slack"}