Slack vs Teams: Which Team Chat Is Better in 2026?
Slack and Microsoft Teams are the two team chat platforms most often shortlisted by organizations in 2026, and they serve very different masters. Slack wins on speed, channel-based communication, third-party integrations, and cross-company collaboration. Teams wins on bundled value with Microsoft 365, built-in video conferencing, and enterprise compliance. This comparison breaks down features, pricing, integrations, video, and security so you can pick the right one.
Quick Comparison
| Feature | Slack | Microsoft Teams |
|---|---|---|
| Best For | Startups, cross-company collaboration | Microsoft 365 organizations |
| Free Tier | Limited, 90 days of messages | Yes, with 5 GB storage |
| Pro Plan Price | $7.25/user/mo | $6/user/mo (M365 Business Basic) |
| Message History | Unlimited on Pro and above | Unlimited on all paid plans |
| App Integrations | 2,400+ | 1,800+ |
| Video Calls | Huddles (up to 50) | Up to 1,000 interactive |
| File Storage | 1 TB on Business+ | 1 TB OneDrive per user |
| Office Suite | No native apps | Word, Excel, PowerPoint built-in |
| Cross-company Channels | Slack Connect | External guests, limited |
| AI Features | Slack AI (summaries, search) | Copilot for Microsoft 365 |
| SSO and SCIM | Business+ and above | All business plans |
| Compliance | Enterprise Grid | Purview, eDiscovery native |
| Mobile Apps | iOS, Android | iOS, Android |
What Is Slack?
Slack is a team communication platform launched in 2013 by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov. It grew out of an internal tool used by their gaming company Tiny Speck and became the default chat app for startups and modern tech companies. Slack pioneered the channel-based communication model, where conversations are organized into topic-specific channels instead of private email threads.
The current version supports channels, direct messages, threads, voice and video Huddles, Canvas for shared documents, and Slack AI for summaries and search. Slack integrates with 2,400+ third-party apps including Google Workspace, Salesforce, Zoom, GitHub, and Asana. Slack Connect lets you create shared channels with external companies, which makes it the standard for cross-company collaboration. Pricing starts at free, Pro at $7.25 per user per month, Business+ at $12.50, and Enterprise Grid for large organizations.
What Is Microsoft Teams?
Microsoft Teams is a team communication and collaboration platform launched in 2017 as a replacement for Skype for Business. It is bundled with Microsoft 365 and integrates deeply with SharePoint, OneDrive, Exchange, and Office apps. Teams targets enterprises and mid-sized organizations that already use Microsoft products, and it has grown to over 320 million monthly active users as of 2026.
The current version supports channels, chats, meetings, calls, file collaboration, and apps. Teams includes built-in video conferencing with up to 1,000 participants in interactive meetings and 10,000 in view-only mode. Copilot for Microsoft 365 adds AI features for meeting summaries, action items, and chat search. Pricing is bundled with Microsoft 365: Business Basic at $6 per user per month, Business Standard at $12.50, and Business Premium at $22. Teams is also available as a free tier with limited features.
Channel and Chat Experience
The core of any team chat tool is how conversations are organized. Both Slack and Teams use channels, but Slack's implementation is cleaner and faster.
Slack Channels
Slack's channel UI is the standard. Channels are organized in a sidebar with sections, you can mute or star channels, and threading is optional but supported. The search is fast and supports advanced operators like "from:alice has:link". Slack's interface feels lighter and more responsive than Teams, which matters when you switch between channels hundreds of times per day.
Teams Channels
Teams also supports channels, but they are grouped into Teams, which adds a layer of hierarchy that can feel heavy. Threads in Teams are mandatory for channel replies, which can make conversations feel more structured but also more rigid. Search in Teams has improved but is still slower and less precise than Slack.
Winner: Slack wins channel and chat experience.
Integrations and App Ecosystem
Integrations extend what your chat tool can do. Slack has more apps, while Teams has deeper Microsoft integration.
Slack App Directory
Slack has 2,400+ apps in its directory, covering developer tools, marketing platforms, CRMs, and modern SaaS. Slack's API is well-documented and widely supported, and building custom Slack apps is straightforward. Slack also supports Workflow Builder for no-code automations, which lets non-technical users create multi-step workflows.
Teams App Store
Teams has around 1,800 apps, with stronger coverage of enterprise tools like Power BI, Dynamics 365, and SharePoint. Teams also supports custom apps through the Microsoft Graph API and Power Platform. For organizations already using Microsoft products, the integration is seamless. For modern SaaS tools, Slack has broader coverage.
Winner: Best third-party app ecosystem goes to Slack. Best Microsoft integration goes to Teams.
Video Conferencing
Built-in video calls matter more than ever in hybrid work. Teams has the edge here.
Slack Huddles
Slack's built-in video tool, Huddles, supports up to 50 participants with screen sharing, threaded chat, and live captions. Huddles are designed for quick, ad-hoc meetings rather than large webinars. For larger meetings, Slack integrates with Zoom, but Zoom requires a separate subscription.
Teams Meetings
Teams supports up to 1,000 participants in interactive meetings and 10,000 in view-only webinars. It includes built-in recording, transcription, live captions, breakout rooms, and Copilot AI for summaries and action items. For organizations that run large meetings or webinars, Teams is the better choice.
Winner: Teams wins video conferencing.
Pricing Comparison
Pricing depends on whether you bundle with other tools. Teams is cheaper when bundled with Microsoft 365, while Slack is comparable for chat-only.
| Tier | Slack | Microsoft Teams |
|---|---|---|
| Free | Limited, 90 days of messages | Yes, with 5 GB storage |
| Pro | $7.25/user/mo | $6/user/mo (M365 Business Basic) |
| Business | $12.50/user/mo (Business+) | $12.50/user/mo (M365 Business Standard) |
| Enterprise | Custom (Enterprise Grid) | $22/user/mo (Business Premium) |
| Bundled Office Apps | No | Yes, all paid plans |
| Bundled Storage | 1 TB on Business+ | 1 TB OneDrive per user |
| Bundled Email | No | Yes, Exchange mailbox |
| Video Participants | 50 (Huddles) | 1,000 interactive |
| AI Features | Slack AI add-on | Copilot add-on ($30/user/mo) |
For organizations that need Office apps, email, and file storage anyway, Microsoft 365 Business Basic at $6 per user per month is effectively free for Teams. Slack Pro at $7.25 per user per month only includes Slack, so you need separate subscriptions for email, file storage, and Office apps.
For chat-only use cases, Slack Pro is comparable in price to Teams and offers a better chat experience. The decision usually comes down to whether you also need the Microsoft 365 bundle.
Winner: Best bundled value goes to Teams. Best chat-only value goes to Slack.
Security and Compliance
For regulated industries, security and compliance matter as much as features. Teams has a slight edge.
Slack Security
Slack supports SSO, SCIM provisioning, audit logs, data loss prevention, and enterprise key management on Enterprise Grid. Slack is SOC 2 Type II, HIPAA, and GDPR compliant. However, deep compliance features like eDiscovery and legal hold often require third-party tools like Smarsh or Globanet.
Teams Security
Teams inherits Microsoft's enterprise security stack, including Active Directory, Conditional Access, Microsoft Purview compliance, eDiscovery, and legal hold. Teams is SOC 2, HIPAA, GDPR, and FedRAMP compliant. For regulated industries like finance, healthcare, and government, Teams has the most complete native compliance story.
Winner: Teams wins security and compliance.
Cross-Company Collaboration
If you work with external partners, clients, or vendors, how the chat tool handles external users matters.
Slack Connect
Slack Connect lets you create shared channels with external companies. Both sides see the same channel in their own Slack workspace, and messages flow seamlessly. This is the best cross-company collaboration experience in 2026 and is a major reason why startups and agencies prefer Slack.
Teams External Access
Teams supports external access through guest accounts, where external users join your Teams workspace with limited permissions. This works but is heavier than Slack Connect because external users must switch contexts to your Teams instance. For organizations that collaborate with many external partners, Slack is the better choice.
Winner: Slack wins cross-company collaboration.
Mobile Experience and AI Features
Hybrid work means your team chat tool has to work well on phones, not just desktops. Both Slack and Teams have mature mobile apps, but they differ in speed, reliability, and offline behavior. AI is also now a core feature of team chat, used for search, summaries, and drafting replies.
Slack Mobile
Slack's iOS and Android apps are fast and responsive, closely matching the desktop experience. Push notifications are reliable and can be customized per-channel, per-device, and per-hours. Slack's mobile app supports Huddles, threaded replies, file sharing, and search with the same speed as desktop. The app also handles network transitions well, switching between Wi-Fi and cellular without dropping a Huddle. One weakness is offline support: Slack caches recent messages but does not let you compose or schedule messages offline. For users who travel frequently, this can be a frustration.
Teams Mobile
Teams' mobile app is functional but heavier than Slack. It takes longer to launch, and switching between chats, channels, and files can feel sluggish on older devices. Teams compensates with deeper offline support: you can read cached messages and draft replies offline, which sync when you reconnect. Push notifications are reliable but less granular than Slack. Teams mobile also supports meeting join with one tap, which is convenient for users who take calls on the go. For organizations standardizing on Microsoft 365, the Teams mobile app is good enough, but Slack wins on raw mobile polish.
Slack AI
Slack AI is a paid add-on that generates channel summaries, thread recaps, and search answers in natural language. You can ask "what did the engineering team decide last week?" and Slack AI will summarize relevant channels. Slack AI also drafts replies based on context, which speeds up response time for support and account management teams. The add-on is priced per user per month and is available on Pro and above. For chat-focused AI, Slack AI is cheaper and more focused than Microsoft's offering.
Copilot for Teams
Copilot for Microsoft 365 is a more comprehensive AI assistant that works across Teams, Outlook, Word, and PowerPoint. In Teams, Copilot summarizes meetings, generates action items, answers questions about chat history, and drafts replies. Copilot is more expensive than Slack AI at $30 per user per month, but it covers more surfaces than just chat. For organizations that want AI across the entire Office suite, Copilot is the better value. For chat-only AI, Slack AI is the more practical choice.
Winner: Best mobile speed and chat-focused AI go to Slack. Best offline support and cross-app AI value go to Teams.
Pros and Cons
Slack Pros
- Best channel-based chat experience in the category
- 2,400+ third-party app integrations
- Slack Connect for seamless cross-company channels
- Fast, responsive interface across all platforms
- Workflow Builder for no-code automations
- Slack AI for summaries and search
- Cross-platform including Linux
Slack Cons
- No bundled Office apps or email
- Built-in video limited to 50 participants
- AI features require paid add-on
- Compliance often needs third-party tools
- Enterprise Grid pricing opaque
- Free tier limits message history to 90 days
Teams Pros
- Bundled with Microsoft 365 at no extra cost
- Best built-in video conferencing up to 1,000 participants
- Deep integration with SharePoint, OneDrive, Exchange
- Native compliance with Purview, eDiscovery, legal hold
- Copilot AI for meeting summaries and action items
- Active Directory integration for enterprise IT
- Free tier with 5 GB storage
Teams Cons
- Channel UI feels heavier and less responsive than Slack
- Search is slower and less precise
- Mandatory threading can feel rigid
- Fewer third-party app integrations
- External collaboration less seamless than Slack Connect
- Copilot AI requires $30 per user per month add-on
Who Should Use Which?
Startups and Modern Tech Companies
If you are a startup or modern tech company that values speed, third-party integrations, and cross-company collaboration, Slack is the better choice. The channel experience is best in class, the app directory covers modern SaaS, and Slack Connect makes working with external partners seamless. Startups consistently prefer Slack.
Microsoft 365 Enterprises
If your organization already uses Microsoft 365 for email, file storage, and Office apps, Teams is the natural default. It is bundled at no extra cost, integrates deeply with SharePoint and OneDrive, and inherits Active Directory security. For Microsoft-centric enterprises, switching to Slack means paying for chat on top of Microsoft 365.
Agencies Working with External Clients
If you are an agency that collaborates with many external clients, Slack is the better choice. Slack Connect lets you create shared channels with each client, so conversations live in one place without switching workspaces. Agencies consistently prefer Slack for client communication because it feels lighter and more professional than guest accounts in Teams.
Regulated Industries
If you work in finance, healthcare, government, or another regulated industry, Teams is the safer choice. Microsoft Purview, eDiscovery, legal hold, and FedRAMP compliance are built in natively. Slack meets most compliance requirements but often requires third-party tools for archiving and legal hold.
Organizations Running Large Meetings
If your organization runs large meetings, webinars, or town halls, Teams is the better choice. It supports up to 1,000 participants in interactive meetings and 10,000 in view-only mode, with built-in recording, transcription, and Copilot AI. Slack Huddles cap at 50, so for large meetings you would need a separate Zoom subscription.
Real-World Use Cases
50-person startup coordinating product launch
A 50-person startup coordinates a product launch across engineering, marketing, and sales. Slack channels organize conversations by team and by project, integrations with GitHub, Linear, and HubSpot surface updates automatically, and Slack Connect lets the marketing agency collaborate in a shared channel. The team moves fast without leaving Slack. Teams would work but the channel UI feels heavier and the third-party app coverage is thinner for modern SaaS.
5,000-person enterprise migrating to hybrid work
A 5,000-person enterprise migrates to hybrid work and needs chat, video, file storage, and Office apps for every employee. Microsoft 365 Business Standard at $12.50 per user per month bundles Teams, Exchange, OneDrive, and Office apps, which is cheaper than buying Slack, Zoom, Google Workspace, and Office separately. Active Directory integration and Purview compliance satisfy IT requirements.
Marketing agency managing 20 client relationships
A marketing agency manages 20 active client relationships and needs a shared communication channel with each client. Slack Connect creates a shared channel with each client, so the agency sees all client conversations in one workspace. Clients see the channel in their own Slack, which reduces friction. Teams guest accounts would work but require clients to switch contexts to the agency's Teams instance.
Financial services firm with compliance requirements
A financial services firm needs chat that satisfies SEC and FINRA compliance requirements including archiving, eDiscovery, and legal hold. Teams with Microsoft Purview handles all of these natively, and Active Directory integration fits the firm's existing IT stack. Slack would require third-party archiving tools like Smarsh, which adds cost and complexity.
Final Verdict
Best overall for startups and modern teams: Slack. Slack Pro at $7.25 per user per month offers the best channel experience, broadest third-party integrations, and seamless cross-company collaboration. For startups, agencies, and tech companies that value speed and flexibility, Slack is the safer and higher-quality choice.
Best for Microsoft 365 enterprises: Teams. Teams bundled with Microsoft 365 Business Basic at $6 per user per month is the best value for organizations that need chat, video, file storage, and Office apps. For Microsoft-centric enterprises, switching to Slack means paying for chat on top of Microsoft 365.
Best for regulated industries: Teams. Teams with Microsoft Purview, eDiscovery, legal hold, and FedRAMP compliance is the safer choice for finance, healthcare, and government. Slack meets most requirements but often needs third-party tools for full compliance.
Recommended combo: For organizations that need both Microsoft 365 and modern chat, run Teams for internal communication and Slack Connect for external client channels. Total cost is around $13.25 per user per month and covers internal productivity, large meetings, and seamless external collaboration.
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FAQ
Is Slack better than Microsoft Teams?
Slack is better for fast, channel-based communication and third-party integrations. Teams is better for organizations that already use Microsoft 365 because it bundles chat, video, file storage, and Office apps. For startups and cross-company collaboration, Slack wins. For Microsoft-centric enterprises, Teams wins.
Which is cheaper, Slack or Teams?
Teams is cheaper when bundled with Microsoft 365. Microsoft 365 Business Basic at $6 per user per month includes Teams, Exchange, OneDrive, and web Office apps. Slack Pro at $7.25 per user per month only includes Slack. For teams that need Office apps anyway, Teams is effectively free. For teams that only need chat, Slack Pro is comparable in price.
Can Slack and Teams work together?
Slack and Teams do not integrate natively, but third-party tools like Mio and ChatApp bridge messages between platforms. Most organizations pick one platform to avoid fragmentation. A common pattern is Teams for internal communication and Slack Connect for cross-company channels with external partners.
Which has better video conferencing?
Teams has better built-in video conferencing. Teams supports up to 1,000 participants in interactive meetings and 10,000 in view-only mode, with built-in recording, transcription, and Microsoft AI features. Slack's built-in video tool, Huddles, supports up to 50 participants with screen sharing. Slack integrates with Zoom for larger meetings, but Zoom requires a separate subscription.
Does Slack have more integrations than Teams?
Yes, Slack has over 2,400 third-party app integrations compared to Teams' approximately 1,800. Slack's app directory is broader, especially for developer tools, marketing platforms, and modern SaaS apps. Teams has stronger integration with Microsoft products like SharePoint, OneNote, and Power BI, plus the broader Microsoft Graph API.
Which is more secure?
Both meet enterprise security standards with SSO, SCIM provisioning, audit logs, and data loss prevention. Teams has a slight edge for regulated industries because of Microsoft Purview compliance, eDiscovery, and native integration with Active Directory. Slack matches most enterprise requirements but third-party tools fill gaps in archiving and compliance.