Slack FAQ
8 common questions about Slack — answered.
Yes, Slack offers a free plan that includes 90 days of message history, 10 app integrations, and 1:1 huddles. For most small teams just getting started, the free tier is functional but limited. Paid plans start at $8.75/user/month (Pro) for full message history and unlimited integrations.
Slack has four tiers: Free ($0 — 90-day history, 10 integrations), Pro ($8.75/user/month — unlimited history, group huddles, workflows), Business+ ($12.50/user/month — SAML SSO, data exports, 24/7 support), and Enterprise Grid (custom pricing — unlimited workspaces, HIPAA compliance, dedicated support). Annual billing saves roughly 15-20%.
Slack excels at integrations (2,600+ apps), developer workflows, and a polished UX. Microsoft Teams is better for organizations already using Microsoft 365 since it bundles video calling, SharePoint, and Office integration at no extra cost. Slack wins on ease of use and third-party app ecosystem; Teams wins on all-in-one value for Microsoft shops.
Top Slack alternatives include Microsoft Teams (best for Microsoft 365 users), Google Chat (best for Google Workspace users), Discord (best for communities and developer teams), Mattermost (best open-source self-hosted option), and Rocket.Chat (another strong self-hosted choice). Each trades off Slack's polish for cost savings or specific ecosystem integration.
Slack's free and Pro plans support unlimited users per workspace. Business+ is also unlimited per workspace. Enterprise Grid supports unlimited workspaces with up to 500,000+ users across the organization. There's no hard user cap on any plan — Slack scales from 2-person startups to Fortune 500 companies.
Yes. Slack encrypts data in transit (TLS 1.2+) and at rest (AES-256). Business+ and Enterprise Grid add SAML SSO, Enterprise Key Management (EKM) for customer-managed encryption keys, and DLP integrations. Slack is SOC 2 Type II, ISO 27001, and HIPAA compliant (Enterprise Grid). Admins can enforce 2FA and manage session durations.
Slack has over 2,600 apps in its App Directory. Key integrations include Google Drive, Salesforce, Jira, GitHub, Zoom, HubSpot, Asana, Trello, and Zendesk. You can also build custom integrations using Slack's Bolt SDK, Webhooks, or the Workflow Builder's no-code connectors.
For internal team communication, Slack effectively replaces email — most teams see a 30-50% drop in internal emails after adopting Slack. However, Slack doesn't replace email for external communication with clients, vendors, or partners (though Slack Connect allows cross-org channels). Best practice: use Slack for real-time internal chat and email for formal external correspondence.