What is Slack?
Team messaging with AI summaries, search and huddle notes.
Who is Slack best for?
Slack is best for teams that work in chat channels and want AI summaries and search over their own conversations.
Team chat by project
Channels keep each project, team or topic in its own searchable space, and the Free plan keeps 90 days of history at no cost.
Working with clients and vendors
Slack Connect puts people from other companies in shared channels, so outside work stays out of email.
Catching up with AI
Paid plans summarize channels, threads and huddle calls, and Business+ adds Slackbot and AI search over your own messages and files.
Routine requests and approvals
Workflow Builder automates stand-ups, updates and approvals without code, and Slack connects to over 2,600 apps.
How much does Slack cost?
Slack has a free plan with 90 days of message history, and its paid plans cost $8.75 per user a month for Pro or $18 per user a month for Business+ when billed monthly.
- 90 days of message history
- Up to 10 app integrations
- 1:1 huddles and 1:1 messages with people outside your company
- Unlimited message history and app integrations
- Group huddles and shared channels with up to 250 outside organizations
- AI summaries of channels, threads and huddles
- Everything in Pro
- Slackbot AI agent, AI search, daily recaps and file summaries
- SAML single sign-on and SCIM user management
Billed yearly, Pro is $7.25 and Business+ $15 per user a month. Slack charges only for active users. Enterprise+ adds enterprise search across connected apps, multiple SAML setups, data loss prevention and unlimited workspaces, and is priced through Slack's sales team. On the Free plan, Slack deletes workspace data after 1 year. Full pricing on slack.com. We checked these prices on .
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What are the best Slack alternatives?
Three tools on Recaply do Slack's job. All three are open source, so you can run them on your own server.
BuzzOpen SourceChoose it when you want to host it yourself and keep your data on your own server.
Rocket.ChatOpen SourceChoose it when your chat history must stay on your own servers or an air-gapped network, with no per-seat bill for small teams
MattermostOpen SourceChoose it when chat must stay on servers you control, even air-gapped ones, and the open source edition carries no per-user fee
Articles about Slack
One of our articles covers Slack, with every price checked on the makers' own pages.
Questions about Slack
What is Slack?
Team messaging with AI summaries, search and huddle notes.
Who is Slack for?
Slack is best for teams that work in chat channels and want AI summaries and search over their own conversations.
Does Slack's free plan delete old messages?
Yes. Slack's Free plan shows and searches only the last 90 days of messages and files, and Slack deletes Free workspace data after 1 year. Pro and Business+ keep the full history, and paid plans hold data for good unless admins set shorter retention.
How much does Slack cost?
Slack's paid plans are Pro at $8.75 per user per month and Business+ at $18 per user per month.
Is there an open source alternative to Slack?
Yes. Buzz, Rocket.Chat, Mattermost and Fluxer and 8 more are open source tools that do the same job, so you can run your own.
What are the best Slack alternatives?
The closest alternatives on Recaply are Buzz, Rocket.Chat and Mattermost.
Where can I try Slack?
On its official website, slack.com.
Which Slack plans include AI?
Slack's Free plan has no AI features. Pro adds AI summaries of channels, threads and huddle calls. Business+ adds Slackbot, AI search, daily recaps, file summaries and AI-built workflows, and Enterprise+ also searches connected apps outside Slack.
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