Slack

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.