Slack vs Microsoft Teams 2026: Real Cost for 25 People and Which Is Easier to Automate

Slack or Microsoft Teams: which costs less? The short answer

As of November 2026, Teams is cheaper on paper and often free in practice: it comes inside Microsoft 365 Business Basic ($7 a user a month) and Business Standard ($14), or costs $4 a user on its own as Teams Essentials. Slack Pro is $7.25 a user a month billed annually ($8.75 monthly) and Business+ is $15 ($18 monthly). For 25 people already on Microsoft 365, adding Slack Pro costs about $1,212 a year once you switch to Microsoft's no-Teams plan. The bigger difference for automation: since May 2026, posting into Teams from outside runs through Power Automate.

Prices come from Slack's and Microsoft's own pricing pages, and the connector change from Microsoft's developer blog and Teams documentation, all read November 13, 2026. All prices are per user a month in US dollars, billed annually unless we say otherwise.

Slack vs Teams prices side by side

The comparison most pricing pages get wrong is Teams Essentials ($4) against Slack Pro ($7.25). Most small businesses don't buy Teams on its own. They get it with their email, which means the real question is what Slack adds on top of a Microsoft 365 or Google Workspace bill you are already paying. Slack also bills only active members, so seasonal staff cost less than the list math suggests; how that credit works is on our Slack pricing page.

A worked bill for a 25-person company

Here is what each choice adds to the year for the same 25 people, depending on where their email lives.

The no-Teams row is the one people miss. If you are on Microsoft 365 and the team wants Slack, paying for Teams you won't open is $3.21 a user a month on Business Standard, or $963 a year for 25 people. Microsoft sells the same plans without Teams, so the real cost of Slack in a Microsoft shop is the gap, not the full Slack bill.

At 10 people the same choice is small money either way: Teams Essentials $40 a month, Slack Pro $72.50, Slack Business+ $150. At that size, pick on which one your team will actually use, and on the automation question below.

Which is easier to automate?

This is where the two now differ most, and it changed this year. In May 2026 Microsoft retired the Office 365 connectors in Teams, including the connector-based incoming webhooks that many tools used to drop alerts into a channel. Microsoft's developer blog set the shutdown for May 18 to May 22, 2026, and the Teams documentation now points everyone to the Workflows app, which runs on Power Automate. So in Teams, "post a new lead into the sales channel" is now a Power Automate flow, not a URL you paste into your form tool.

That matters for the bill and for who owns it:

• Licensing. Microsoft 365 licenses include Power Automate with standard connectors only. If a flow uses a premium connector, Microsoft's licensing FAQ says the user running it needs Power Automate Premium at $15 a month, or the flow needs a Process license at $150 a month. Our Power Automate pricing page walks through who has to be licensed.
• Ownership. A flow belongs to the account that built it. Build alerts under a shared service account, not the office manager's login, or they stop when that person's account is closed.
• AI agents inside Teams. A Teams bot that answers from your own documents is usually built in Copilot Studio, which has its own meter; see our Copilot Studio pricing breakdown.

Slack keeps the simpler path. A Slack app can still take an incoming webhook, so a form, CRM or phone system can post into a channel with one URL and no per-user license on the automation side. The limits are rate limits, not licenses, and they are listed on our Slack pricing page linked above.

If you run an automation platform in the middle, the difference shrinks. Zapier, Make and n8n all connect to both Slack and Teams, so the platform holds the logic and the chat tool just receives the message. How those three price the same workflow is in our n8n vs Make vs Zapier comparison.

Which one should a small business pick?

• You already pay for Microsoft 365: Teams. It costs nothing extra, and Power Automate's standard connectors cover most alerts. Budget $15 a month for one Premium seat if your flows need premium connectors.
• You run on Google Workspace and want the cheapest option: Teams Essentials at $4 a user, about $975 a year less than Slack Pro for 25 people.
• Your team lives in chat and you plan to wire in a lot of tools: Slack Pro. The webhook path is simpler, and most business software ships a Slack integration first.
• You are on Microsoft 365 but the team prefers Slack: switch to the no-Teams plan before you add Slack, so you aren't paying twice.

Who can build Slack or Teams bots and automations for my business?

An alert into a channel is an afternoon's work in either tool. The paid work is a bot that knows your business: answering staff questions from your own documents, looking up a customer or job in another system, routing requests and posting the result back. SuperDupr, the AI ops shop Justin McKelvey runs, builds those on Slack or Teams, whichever you already use. A bot that answers from your own data is one of our AI chatbots builds, published at $5,000 to $10,000, and when it also moves work between your other tools it becomes an AI workflow automation project at $10,000 to $25,000. Most go live in 2 to 4 weeks, with $200 to $2,000 a month in running costs depending on volume. We don't resell Slack or Microsoft licenses. The first step is a free 30-minute strategy session, booked from that page.

Sources

• Slack pricing (slack.com/pricing) and Slack's Business+ page, read November 13, 2026: Pro $7.25 per user a month billed annually, $8.75 monthly; Business+ $15 per active user billed annually, $18 monthly; Enterprise+ contact sales. Slack's June 2025 pricing announcement on slack.com: Business+ annual price up from $12.50 to $15, Pro unchanged.
• Microsoft Teams Essentials and Teams business options pages (microsoft.com), read November 13, 2026: Teams Essentials $4.00 per user a month, paid yearly, 10 GB cloud storage per user.
• Microsoft 365 business plans pages, with and without Teams (microsoft.com/en-us/microsoft-365/business), read November 13, 2026: Business Basic $7.00 yearly ($8.40 monthly billing), Business Standard $14.00 yearly ($16.80 monthly billing); without Teams $5.40 and $10.79.
• Microsoft 365 Developer Blog, "Retirement of Office 365 connectors within Microsoft Teams," and Microsoft Learn, Teams "Webhooks and connectors," read November 13, 2026: connectors progressively disabled May 18 to May 22, 2026, connector-based incoming webhooks retired, Workflows app as the replacement.
• Microsoft Power Automate pricing page and Power Platform licensing FAQ (microsoft.com, learn.microsoft.com), read November 13, 2026: Premium $15 per user a month billed yearly; Process $150 per bot a month; Microsoft 365 licenses limited to standard connectors.
• The 25-person and 10-person bills: SuperDupr's arithmetic on the prices above.