Slack vs Microsoft Teams: Which One Wins?

The Short Answer

If your company already pays for Microsoft 365, use Teams — it’s included and the integration is unbeatable. If you don’t, or if integrations with third-party tools matter more than Microsoft’s ecosystem, go with Slack. That’s the honest take, and the rest of this article is basically the evidence behind it.

Pricing Breakdown

Let’s get the money question out of the way first, since it often makes the decision for you.

Slack:

• Free — 90-day message history, 1:1 calls only, 10 integrations
• Pro — $8.75/user/month (annual) — full history, group calls, unlimited integrations
• Business+ — $12.50/user/month — SAML SSO, data exports, 24/7 support
• Enterprise Grid — custom pricing — unlimited workspaces, HIPAA compliance

Microsoft Teams:

• Free — 100 participants in meetings, 5GB storage, limited features
• Microsoft 365 Business Basic — $6/user/month — includes Teams + web Office apps
• Microsoft 365 Business Standard — $12.50/user/month — includes desktop Office apps
• Microsoft 365 Business Premium — $22/user/month — adds security features

Here’s the thing most comparisons miss: you can’t really compare these prices directly. Teams comes bundled with Office apps, cloud storage, and email. Slack is just a chat tool. When you factor in that many companies already pay for Microsoft 365 for Outlook and Office alone, Teams is effectively “free” for them. That’s a massive advantage.

Chat and Messaging

This is where Slack genuinely shines. The messaging experience is smoother, faster, and more intuitive than Teams. Channels are easy to organize, threads work logically, and the whole thing just feels snappy.

Slack’s message formatting is better (code blocks, quotes, lists all work predictably), emoji reactions are more useful (teams use them for polls, acknowledgments, and workflows), and Slackbot is handy for reminders and custom responses.

Teams messaging works fine but has quirks that drive people crazy. The threading model is confusing — you can reply to a message, but the reply sometimes shows in the main chat and sometimes doesn’t, depending on how you click. Rich text editing defaults to a WYSIWYG editor that occasionally mangles formatting. And the search, while improved, still isn’t as reliable as Slack’s.

One area Teams does better: persistent chat alongside meetings and file sharing. A Teams channel isn’t just a chat room — it’s a hub with tabs for files, tasks, notes, and apps. This is useful but also adds complexity. For teams already using dedicated project management tools, the extra tabs in Teams might feel redundant.

Winner: Slack — The core chat experience is noticeably better.

Video Calls and Meetings

Teams wins this one, and it’s not particularly close. Built-in video meetings in Teams support up to 300 participants (1,000 in higher tiers), with features like breakout rooms, live captions, meeting recording with automatic transcription, and a virtual whiteboard.

Slack has Huddles — lightweight audio/video calls that live inside channels. They’re great for quick, informal conversations (think “hey, can we talk about this for a sec?”), but they aren’t built for formal meetings. No scheduling, no recording, no breakout rooms. For actual meetings, Slack expects you to use Zoom or Google Meet through integrations.

If your team does a lot of video meetings and you want to minimize the number of tools you’re paying for, Teams gives you a solid remote team communication suite in one package. Slack makes you cobble it together.

Winner: Microsoft Teams — Full-featured meetings built right in.

Integrations and App Ecosystem

Slack’s app directory has over 2,600 integrations. Teams has around 1,400. But numbers don’t tell the whole story.

Slack integrations tend to be deeper and more polished. The Jira integration in Slack, for example, lets you create issues, transition tickets, and get detailed notifications — all without leaving the chat. The same integration in Teams is more basic. GitHub, Salesforce, Figma, Notion — most third-party tools prioritize their Slack integration because that’s where their users are.

Teams integrations work best within the Microsoft ecosystem. SharePoint, Power BI, Dynamics 365, Power Automate — these all connect natively and work beautifully. If you’re running your business on Microsoft tools, the integration depth is actually better than Slack’s, because it’s all first-party.

For teams that use a mix of tools from different vendors — which is most teams — Slack’s broader ecosystem is a significant advantage. If you’re curious about how different tools play together, our guide to choosing business software covers integration considerations in detail.

Winner: Slack — Wider, deeper third-party integrations. Teams wins for Microsoft-native stacks.

File Sharing and Collaboration

Teams has a clear edge here thanks to SharePoint and OneDrive integration. Files shared in a Teams channel are automatically stored in a structured SharePoint folder. You can co-edit Word, Excel, and PowerPoint files directly inside Teams. Version history, permissions, and organization are all handled by SharePoint behind the scenes.

Slack treats files as attachments to messages. They get uploaded, they sit in the channel, and finding them later means scrolling or searching. There’s no built-in file organization, no co-editing, and files on the free plan get deleted after the 90-day history limit. You can connect Google Drive or Dropbox, but it’s not the same as Teams’ native file management.

Winner: Microsoft Teams — Native file management and co-editing are genuinely useful.

User Experience and Performance

Slack feels faster. Channel switching is nearly instant, search results appear as you type, and the app generally stays out of your way. The UI is clean without being sparse — you can find what you need without clicking through multiple menus.

Teams is heavier. It uses more RAM (often 500MB+), takes longer to start up, and switching between chats, teams, and channels has noticeable lag on average hardware. The UI has improved significantly over the past two years, but it’s still more cluttered than Slack’s. There are more menus, more settings, and more things competing for your attention.

Mobile apps tell a similar story. Slack’s mobile app is responsive and mirrors the desktop experience well. Teams mobile works but can feel cramped, with too many features squeezed into a small screen.

Winner: Slack — Lighter, faster, and more intuitive.

Security and Compliance

Both tools offer enterprise-grade security, but Teams has an advantage for organizations with strict compliance requirements. Microsoft 365’s compliance center covers Teams data with DLP policies, eDiscovery, information barriers, and retention policies. If you’re in a regulated industry, this matters.

Slack’s Enterprise Grid tier offers similar compliance features (DLP, data residency, eDiscovery), but you’ll pay significantly more for it. For mid-sized companies on Slack’s Pro or Business+ plans, compliance options are more limited.

Both support SSO, MFA, and encryption in transit and at rest. For day-to-day security, they’re roughly equivalent. For deep compliance needs, Teams usually wins on value because these features come bundled with Microsoft 365.

Winner: Microsoft Teams — Compliance features included at lower price points.

AI Features

Both platforms have gone all-in on AI in 2025-2026. Slack’s AI (available on paid plans) summarizes channels, catches you up on unread conversations, and answers questions about your workspace’s knowledge base. It’s useful for the “I was out for a week, what happened?” scenario.

Microsoft’s Copilot in Teams goes further — it can summarize meetings in real time, generate action items, draft follow-up emails, and search across your entire Microsoft 365 data. But Copilot is an add-on at $30/user/month, which is a steep price tag on top of your existing subscription.

If you’re willing to pay for Copilot, Teams’ AI is more capable. If you want AI included in your existing plan, Slack delivers solid value. For a broader look at tools with built-in AI features, see our all-in-one business software roundup.

Winner: Tie — Depends on budget and needs.

Feature Comparison Table

Final Verdict

This really comes down to your existing stack. If your company runs Microsoft 365, Teams is the obvious choice — it’s included in your subscription, integrates deeply with Office apps, and handles video meetings well enough to skip Zoom. Fighting against that gravity doesn’t make sense.

If you’re not locked into Microsoft, Slack is the better communication tool. The chat experience is smoother, integrations are deeper and more varied, and the app is faster and lighter. You’ll need to pair it with a separate video tool, but the core messaging experience is worth it.

Neither tool is bad. Both have gotten significantly better over the past year. The “right” choice isn’t about which tool is objectively superior — it’s about which one fits your team’s existing workflow with the least friction. If you’re still on the fence, both offer free tiers. Try each for a week with your actual team and see which one sticks. You might also want to explore Notion alternatives if you need collaboration features beyond chat.