Slack is Salesforce's team chat app, with channels, huddles, canvases, lists and Workflow Builder, and since mid-2025 its AI features come with the plans instead of a separate $10 add-on. Free shows 90 days of message history, allows 10 apps and includes no AI features. Pro costs $8.75 per user a month, or $7.25 billed annually, and adds conversation summaries and huddle notes. Business+ at $18 per user a month ($15 annually) adds Slackbot as a personal AI agent, AI search, daily recaps, file summaries, translations and SAML single sign-on. You pay only for members active in the past 28 days.
Reviewed by EdGrows·Updated Sep 29, 2026This analysis is based on documentation, public user reports, and vendor materials — not yet on our own hands-on testing. How we rate
Slack is where many companies do their talking. Conversations live in channels organized by team, project or client, alongside direct messages, huddles for quick audio and video calls, canvases for documents, lists for tracking work and Workflow Builder for automating routine requests. Slack Connect extends channels to people at other companies, so an agency and its client, or a vendor and a customer, can work in one shared space instead of email threads.
Salesforce bought Slack in 2021, and the product now carries "from Salesforce" in its logo. The 2026 homepage leads with AI: "All your people and AI agents working together", with Slackbot rebuilt as a personal AI agent: "Slack connects your team. Slackbot multiplies what they can do." A banner above it announces Slack Code with the line "Now building is a team sport."
What has not changed is why companies pick Slack: its integrations and its speed as a place to coordinate. The AI features are the newest layer, and the most important thing to understand before choosing a plan, because they are spread unevenly across the tiers.
Until mid-2025, Slack AI was a separate add-on at $10 per user a month on top of any paid plan. In June 2025 Slack announced the end of that model. Two features, conversation and thread summaries and huddle notes, became part of every paid plan. The advanced features, including AI search, recaps, file summaries and translations, moved into a new version of Business+, and Business+ rose from $12.50 to $15 per user on annual billing.
Existing customers moved over at their first renewal after August 17, 2025, and the add-on can no longer be bought. The result is simpler billing and a clearer upsell: the AI that most people associate with "Slack AI" now sits in Business+, not in Pro.
Slack's pricing page as shown to us in euros on September 29, 2026, with an introductory offer of 50% off for three months. Slack sets prices by region.
| Plan | Price per user a month | History and apps | AI included |
|---|---|---|---|
| Free | $0 | 90 days of messages, 10 apps, 1:1 huddles and external messages | None |
| Pro | $8.75 monthly, $7.25 annually (€8.25 or €6.75) | Unlimited history and apps, group huddles and Slack Connect | Conversation and thread summaries, huddle notes |
| Business+ | $18 monthly, $15 annually (€18 or €15) | Everything in Pro, SAML SSO, SCIM, data exports for all messages | Slackbot agent, AI search, daily recaps, file summaries, translations, AI workflow generation |
| Enterprise+ | Custom (€45 annually in the euro listing) | Unlimited workspaces, multiple SAML configurations, data loss prevention, EMM | Everything in Business+ plus enterprise search |
US dollar prices as listed by pricing trackers; euro prices from Slack's own page. Business+ support promises a four-hour first response.
Two details from the plan cards change the math. Pro's AI is limited to summaries and huddle notes, so a team buying Pro for "Slack AI" gets less than it expects. And Business+ is where Slack's identity and compliance features start, including SAML single sign-on, SCIM user management and message exports, so companies with an IT or legal requirement often land there for reasons unrelated to AI.
Slack's free plan works for small groups, with two limits worth knowing before a team builds habits on it. Only the last 90 days of messages and files are visible and searchable, and since August 2024 Slack deletes messages and files older than one year on free workspaces. A decision made in a channel last spring is invisible after three months and gone after twelve.
Free also allows only 10 app integrations, 1:1 huddles and 1:1 external messages, and includes none of the AI features. For a community, a club or a short project it is enough; for a company that needs its history, it is a trial with a clock on it.
Slack's billing is kinder than most per-seat software. A member counts as active if they take any action in Slack within a 28-day period, and when someone you have already paid for goes quiet, Slack credits the unused time back to your account. Contractors who drop in for one project, or staff who leave without being deactivated promptly, stop costing money on their own.
New members work the other way: adding someone mid-cycle is charged pro rata for the rest of the billing period, and on annual plans those additions appear as a charge at the end of the month. Annual customers can also switch to invoicing and pay by ACH or wire transfer.
For a team that wants AI in Slack, Business+ is the real product. Slackbot works as a personal agent you can ask about your work in Slack, AI search answers questions from your workspace's history, daily recaps summarize the channels you choose, and file summaries save opening long documents. At $15 per user a month on annual billing, a 20-person team pays $300 a month against $145 for Pro.
Whether that is worth it depends on how much reading your team does in Slack. A company where people return from a day of meetings to hundreds of unread messages gets the most from recaps and search. A small team with a handful of busy channels gets most of the value from Pro's summaries and can leave the rest. The identity features settle it for many companies anyway: if you need SAML single sign-on, Business+ is the minimum plan.
Enterprise+ is for large organizations that need multiple workspaces, data loss prevention, mobile device management and enterprise search across other company systems. Its price is set by quote.
Microsoft Teams is the usual alternative, and for companies already on Microsoft 365 it is the path of least resistance, with its AI sold through Microsoft Copilot. Google Chat plays the same role inside Google Workspace. Slack's case against both is integrations, Slack Connect and a messaging experience many teams prefer, which is why companies that could use Teams for no extra cost still pay for Slack.
Smaller teams sometimes skip a chat app altogether and talk inside their project tool: ClickUp has chat built in, and Notion covers documents and discussion in one place. For meetings, Zoom's built-in AI competes with Slack's huddle notes. Automation-heavy teams often connect Slack to other apps through Zapier, since Workflow Builder handles only simpler flows.
Ongoing access to Slackbot, Slack's personal AI agent, comes with Business+ and Enterprise+. Slack's pricing FAQ says Free and Pro users are getting a limited trial of Slackbot, and that Salesforce CRM customers who connect their accounts to Slack will also receive ongoing access. Business+ customers on invoiced plans can buy Flex Credits through Salesforce for higher Slackbot message limits.
No. On Slack's pricing page every AI feature is greyed out for Free, including conversation summaries. Pro includes conversation and thread summaries and huddle notes; search, recaps, file summaries, translations, AI workflow generation and Slackbot need Business+. Slack says it does not use customer data to train language models and runs its models inside its own cloud environment.
Free workspaces can see and search only the last 90 days of messages and files. Since August 2024 Slack also deletes messages and files older than one year on free workspaces, so older history is gone, not just hidden. Upgrading to a paid plan restores access to anything still inside the one-year window.
No. Slack bills only for active members, meaning people who take any action in Slack within a 28-day period. If someone you already paid for becomes inactive, Slack adds a prorated credit to your account for the unused time. New members added mid-cycle are charged a prorated amount for the rest of the billing period.
Slack stopped selling it. Announced in June 2025, the change folded AI into the plans: Pro gained summaries and huddle notes, and the advanced features moved into a new version of Business+, whose annual price rose from $12.50 to $15 per user. Customers who had bought the $10-per-user add-on kept it until their first renewal after August 17, 2025.
Slack regularly runs introductory offers. When we checked in September 2026 in euros, Pro and Business+ were 50% off for the first three months on monthly billing, with terms applying. Nonprofits and educational institutions can apply for separate discount programs, which Slack links from its pricing FAQ.
Yes, on annual billing. Any plan can be paid by credit card, and teams paying annually may be eligible for invoicing with payment by ACH or wire transfer. Card payments are charged on the purchase date and then on each monthly or annual renewal, with an extra charge at month end for members added to an annual plan.
Teams is the default for companies already on Microsoft 365, since it ties into Outlook, SharePoint and Office files. Slack is the stronger choice for companies that live in their integrations and talk to outside partners, because Slack Connect shares channels between organizations and its integrations run deep. Price rarely decides it: the suite a company already pays for usually does.
Anthropic's assistant, built around long-context reasoning and code. Strong at $20; the usage limits are the unpublished part.
Google's assistant, bundled with storage and Workspace access. Plus is $4.99, Pro $19.99 with a 1 million token context, and Ultra from $99.99.
Visual automation with 3,000+ apps, billed in credits: a free plan with 1,000 a month, then $9 to $29 a month billed yearly for 10,000 credits.