SideGuy Comparison · Updated 2026

Slack vs Microsoft Teams (2026): Most SMBs don't need Teams unless they're already Microsoft 365

⚡ Slack vs Microsoft Teams: Quick Answer

If you're already paying for Microsoft 365, Teams is essentially free — use it. If you're not in the Microsoft ecosystem and your team is under 20 people, Slack's free tier plus its superior search and third-party integrations usually wins. The feature gap has narrowed, but the ecosystem question is what matters most.

Two messaging platforms that run half the world's offices. One is built for speed and integrations. One is built for Microsoft shops. Here is the real difference.

Slack vs Microsoft Teams

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Head-to-Head Comparison

Feature	Slack	Microsoft Teams
Free plan	90-day message history	Unlimited (limited features)
Paid from	$7.25/user/mo (Pro)	$6/user/mo (M365 Business Basic)
Video calls	Huddles — lightweight	Teams Meetings — full featured
File storage	10GB team (free)	1TB OneDrive per user
Integrations	2,600+ apps	700+ apps (strong MS stack)
Search	Excellent	Good, improving
Mobile UX	Best in class	Good
Guest access	Yes	Yes (external users)
Channels	Flexible threading	Teams + Channels structure
AI features	Slack AI ($10+/user)	Copilot ($30/user add-on)

Pricing Breakdown

Tier	Slack	Microsoft Teams
Free	$0	$0 (limited)
Entry paid	$7.25/user/mo	$6/user/mo (M365 Basic)
Business	$12.50/user/mo	$12.50/user/mo (M365 Standard)
Enterprise	Custom	Custom

Honest Verdict

Slack wins on UX, integrations, and developer culture. Teams wins when your company already runs Microsoft 365 — the value is in the bundle, not the chat. If you're choosing fresh, Slack is faster to adopt and easier to keep organized. If you're already paying for M365, Teams is already included and good enough.

Slack

Best for startups, agencies, and teams that value speed + integrations

Microsoft Teams

Best for Microsoft shops already on M365 — it's included, don't pay twice

Best For: Scenario Guide

Startup / agency

Slack

Faster onboarding, better app integrations, cleaner UX

Microsoft 365 shop

Teams

Already included in your M365 subscription — don't pay twice

Developer team

Slack

GitHub, Jira, CI/CD integrations are best-in-class

Enterprise with compliance

Teams

Deep Azure AD integration, eDiscovery, retention policies

Video-heavy team

Teams

Meetings are more polished for large calls

External client comms

Slack Connect

Guest channels keep clients in the loop without email

Frequently Asked Questions

Is Slack better than Microsoft Teams?

Depends on your stack. Slack wins on UX and integrations. Teams wins if you're already on Microsoft 365 — it's included. Most non-Microsoft companies should default to Slack.

Can I use Slack for free?

Yes, but the free plan only shows 90 days of message history. For most teams that's frustrating within a month. Pro plan at $7.25/user/mo is the real starting point.

Does Teams come with Microsoft 365?

Yes — Teams is included in all Microsoft 365 Business plans starting at $6/user/mo. If you're already paying for M365, you're already paying for Teams.

Which is better for remote teams?

Slack for async-first cultures and integrations. Teams for video-heavy, formal meeting cultures. Both work — it's about your team's workflow.

Can I migrate from Slack to Teams?

Yes. Microsoft has a Slack migration tool. Message history, channels, and files can be imported. PJ can walk you through it if you're making the switch.

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