S

Slack

Productivity & Collaboration

Team messaging and collaboration platform

Founded 2013San Francisco, California, USA10,000+ employeesfreemium · Free planFrom $7.25/user/month (Pro, annual billing)Free Trial
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About Slack

Slack is a team messaging and collaboration platform providing channel-based communication, file sharing, workflow automation, and integrations with over 2,600 business applications. Originally built as an internal tool at a gaming startup and publicly launched in 2014, it was acquired by Salesforce in 2021 for approximately $27.7 billion. It serves over 200,000 paying customers including 77 of the Fortune 100, with users in 150+ countries. Since the acquisition, AI features and Salesforce CRM integration have become central to the product roadmap.

Editorial Assessment

Slack established the modern channel-based messaging model for workplace communication, effectively replacing email for internal team coordination at many organizations. Its core strength is the integration ecosystem — with 2,600+ app connections, it functions as a central hub where notifications, alerts, and workflows from external tools surface in context. Since the Salesforce acquisition in 2021, AI features and CRM integrations have become central to the product roadmap. The main trade-offs are that message history is capped at 90 days on the free plan, costs scale linearly per user, and Microsoft Teams (included in M365 subscriptions) creates significant pricing pressure for enterprise buyers. Per-user pricing on Business+ increased in June 2025 following the addition of AI features.

Strengths
  • Channel-based messaging for topic and project organization
  • 2,600+ app integrations making it a central work hub
  • Slack Connect for external cross-organization collaboration without email
  • AI features including conversation summaries and search (paid tiers)
  • Workflow Builder for no-code automation inside Slack
  • Native Salesforce CRM integration on paid plans
Limitations
  • Free plan caps message history at 90 days and integrations at 10 apps
  • Per-user pricing becomes expensive at scale
  • Microsoft Teams included in M365 subscriptions creates significant pricing pressure
  • AI features require Business+ tier or above
  • Product direction dependent on Salesforce's strategic roadmap post-acquisition

Best For

Software and technology companies wanting chat as the primary work hub Teams with heavy third-party tool integration needs Organizations running external client or partner collaboration via Slack Connect Businesses already in the Salesforce ecosystem Remote and distributed teams needing async and real-time communication

Not Ideal For

Large enterprises seeking to minimize per-seat SaaS costs where Teams via M365 is more economicalOrganizations with strict data residency requirements not met by available plansTeams needing a simple communication tool without the complexity of a large integration platform

Key Features

Channel-based messaging for topic and project organization2,600+ app integrations as a central work hubSlack Connect for external cross-organization collaborationAI features including conversation summaries and search (paid tiers)Workflow Builder for no-code automationNative Salesforce CRM integration (paid tiers)

Who It's For

Software and tech companies as primary communication hubTeams with heavy third-party tool integration needsOrganizations running external client collaboration via Slack ConnectBusinesses in the Salesforce ecosystemRemote and distributed teams

Integrations

Google WorkspaceSalesforceZoomGitHubJiraAsana

Platforms

web ios android api

Founders

  • Stewart Butterfield
  • Eric Costello
  • Cal Henderson
  • Serguei Mourachov

Products & Tools

Slack ProTeam Messaging and Collaboration
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First paid tier providing unlimited message history, unlimited app integrations, group huddles, and basic AI features including channel summaries. Removes the key restrictions of the free plan.

subscription · Free plan · Free trialFrom $7.25/user/month (billed annually)
Unlimited message history and searchUnlimited app integrations (2,600+)Group video and audio huddlesSlack Connect for external collaborationNo-code Workflow Builder

Sources & Verification

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Tags

Team MessagingCollaborationRemote WorkEnterprise

Category

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Official Website

slack.com

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