Duplicate software checker · Slack and Microsoft Teams
Do you need Slack if you have Microsoft Teams?
If your Microsoft 365 plan includes Teams, you already pay for team chat. Keeping Slack Pro for 80 people costs US$6,960 a year at list price.
Paying twice
a year on jobs your plan already covers
Assumes the people using these tools also have a Microsoft 365 or Google Workspace licence.
Before cancelling anything, check who actually uses each tool. Price a tool by its active users →
Worked out from the numbers you entered. Nothing leaves your browser. What each plan includes
Starts with 80 people on Slack. Change the plan, the number of people and the price to yours, or add your other tools.
What Slack does that Microsoft Teams doesn't, and the reverse
| Question | Answer | Source |
|---|---|---|
| Working with other companies | Slack Connect channels on paid plans work with up to 250 other organisations. External people in Teams shared channels need a Microsoft work or school account. | learn.microsoft.com |
| History | Paid Slack keeps message history for the life of the workspace by default; the free plan deletes it after a year. | slack.com |
| Group size | Teams allows 25,000 members in a team and 250 people in a group chat. | learn.microsoft.com |
When keeping both makes sense
- Your Microsoft 365 plan was bought without Teams.
- Much of your work happens in Slack Connect channels with other companies.
Fewer isn't affiliated with any company named here. Plan contents and list prices were read on each vendor's own page on 4 November 2026, in US dollars per person a month, billed yearly.
Want to know who uses each one?
In the 14-day trial, Fewer connects to Microsoft 365 or Google Workspace and to Xero, QuickBooks or Ramp, finds every tool you pay for, and shows who actually uses each one. Then it ends what you approve, with a snapshot first so anything can come back.
We'll email you the day the trial opens.
Questions
Do you need Slack if you have Microsoft Teams?
If your Microsoft 365 plan includes Teams, you already pay for team chat. Keeping Slack Pro for 80 people costs US$6,960 a year at list price.
When does it make sense to keep both Slack and Microsoft Teams?
When your Microsoft 365 plan was bought without Teams, or when much of your work happens in Slack Connect channels with other companies.
How much does keeping Slack cost?
Slack Pro lists at US$7.25 a person a month billed yearly (checked 4 November 2026), so 80 people cost US$6,960 a year.
Do you need both? Zoom if you have Microsoft Teams · Zoom if you have Google Meet · Dropbox if you have OneDrive · Dropbox if you have Google Drive
More free tools: Duplicate software checker · SaaS spend per employee · Software license cost calculator