The #1 business messaging platform used by Fortune 100 companies.
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Slack is the business communication platform that has redefined how teams collaborate, replacing scattered email threads and disjointed group chats with organized channels, threaded conversations, and deep application integrations. Used by over 750,000 organizations including 77 of the Fortune 100, Slack has become the default communication layer for knowledge work teams worldwide.
Channels organize conversations by project, topic, team, or any other logical grouping. Unlike email, where important messages are buried in overflowing inboxes, Slack channels create searchable, persistent conversation spaces where every team member — including those who join later — can access the full history. Public channels provide organizational transparency, while private channels and direct messages support confidential communication.
The integration ecosystem with over 2,400 applications transforms Slack from a messaging tool into a work hub. Project management notifications from Asana or Jira, sales alerts from Salesforce, deployment updates from GitHub, customer support tickets from Zendesk — all flow into relevant Slack channels, creating a single pane of glass for work activity.
Huddles provide lightweight audio and video calls that can be started instantly within any channel or direct message. Unlike formal video conference tools, huddles are designed for quick, spontaneous conversations — the digital equivalent of rolling your chair over to a colleague's desk. Screen sharing during huddles enables real-time collaboration without the overhead of scheduling a meeting.
Slack Connect enables secure communication with external partners, clients, and vendors within Slack. For agencies, consultancies, and service businesses that collaborate closely with clients, Slack Connect eliminates the inefficiency of email while maintaining the organization and searchability of Slack.
Workflow Builder is Slack's no-code automation tool that creates custom workflows for common processes: onboarding checklists, request forms, approval processes, and triage workflows. These automations run within Slack, reducing the need for separate task management or process tools.
The free plan includes 90 days of message history and 10 integrations. The Pro plan at 7.25 USD per user per month adds unlimited history and integrations. Business+ at 12.50 USD adds advanced compliance and security features.
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Team messaging and real-time communication
Not ideal for teams under 5 people who can manage with a single group chat in iMessage, WhatsApp, or Discord. Skip Slack if you don't need persistent channels, threaded replies, or integrations with Jira/GitHub/Notion.
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Slack offers a free plan that includes core messaging features with 90 days of message history. Paid plans start at $7.25 per user per month (billed annually), with the Pro plan at $8.75 per user per month adding unlimited message history, group calls, and advanced integrations. Enterprise-level pricing is available for larger organizations with more complex needs.
Slack is a business messaging platform designed to centralize team communication through organized channels and threads, replacing scattered email chains with structured, searchable conversations. The platform also supports audio and video Huddles, no-code workflow automation via Workflow Builder, and secure cross-company collaboration through Slack Connect. It is widely regarded as the leading tool for real-time workplace communication, trusted by Fortune 100 companies globally.
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Pricing source: Official pricing page — Last verified: 7/1/2026
Slack is best suited for businesses of all sizes that rely on fast, organized team communication — from startups to large enterprises. It is particularly valuable for teams that work across departments or with external partners, given Slack Connect's ability to create secure shared channels with outside organizations. Non-technical teams also benefit significantly from Workflow Builder, which automates routine approvals and tasks without requiring any coding knowledge.
Slack is designed for quick onboarding, allowing teams to create channels and invite members within minutes of signing up. The platform supports over 2,400 app integrations, including widely used tools such as Google Workspace, Salesforce, and Jira, enabling teams to connect their existing workflows without significant technical overhead. Workflow Builder further simplifies setup by allowing non-technical users to build automated processes directly within the platform.
One notable limitation of Slack's free plan is that message history is restricted to the most recent 90 days, which can be a significant drawback for teams that rely on referencing past decisions and files. Costs can also escalate quickly for larger teams, as pricing is charged on a per-user basis. Teams with tighter budgets or simpler communication needs may find alternatives such as Microsoft Teams — which is bundled with Microsoft 365 — a more cost-effective option.
