Slack

Slack is Salesforce-owned team-messaging software (acquisition closed July 2021, ~$27.7B); founded 2013 by Stewart Butterfield. Per slack.com/pricing (checked July 2026): Free is $0 and caps message/file history at the most recent 90 days visible in search, with anything over a year old permanently deleted, plus a 10 app-integration ceiling; Pro is $7.25/user/mo billed annually ($8.75 monthly); Business+ is $15/user/mo annually ($18 monthly); Enterprise+ is custom-quoted. All three paid tiers include unlimited message history. AI (Slackbot agent, thread/conversation summaries, workflow generation, daily recaps) is now bundled per tier rather than sold as an add-on; Business+/Enterprise+ add Enterprise Search. Slack reports 200,000+ paid organizations in 150+ countries and use by roughly 77% of the Fortune 100. Current version/status: Continuously-updated SaaS, no version numbers; AI features re-bundled by plan tier since Q2 2025 (checked July 2026). License: proprietary SaaS. Pricing: Free $0 (90-day visible message history, 10 app-integration cap); Pro $7.25/user/mo annual ($8.75 monthly); Business+ $15/user/mo annual ($18 monthly); Enterprise+ custom quote — all paid tiers include unlimited message history. Maintained by Salesforce (acquired Slack Technologies, deal closed July 2021).

Also known as: Slack App, Slack Workspace, Slack Chat, Slack Messenger, Slack Platform

🧊Why learn Slack?

Pick Slack when your team leans on deep third-party integrations (Salesforce, Jira, Google Drive, thousands of apps) and can absorb $7.25-15/user/month. Skip it for a cash-strapped startup — Pumble's free tier gives unlimited users and unlimited message history at $0, where Slack's free tier hides anything past 90 days. Skip it too if you already pay for Microsoft 365 Business Basic ($7/user/mo) — Teams rides along at near-zero marginal cost. Since the Salesforce deal, Slack enforces a roughly 9% year-over-year price bump at renewal, a pattern enterprise buyers openly flag in procurement writeups. The platform's own long-running unsolved complaint is notification overload and channel sprawl — AI recap features are a band-aid on that, not a fix.

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Learning Resources

Slack API Documentation

Slack Pricing Plans

Usage limits for free workspaces

Updates to feature availability and pricing for Slack plans

Related Tools

Slack Api Oauth2 Webhooks Zapier Jira

Alternatives to Slack

Microsoft Teams Google Chat Rocket Chat

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