Slack vs Microsoft Teams in 2026: An Honest Comparison

Slack has 42 million daily active users. Microsoft Teams has 320 million. That gap tells you everything about distribution -- Teams comes bundled with Microsoft 365, so most companies using Word and Excel get it for "free." But user count doesn't mean Teams is better. It means Microsoft is better at bundling.

The real question is which one fits how your team actually works. After Slack bundled AI into all paid plans in mid-2025 and Microsoft's continued Copilot push (plus a July 2026 price increase across all M365 plans), the comparison has shifted significantly. Here's where things stand.

Pricing compared

The big pricing shift happened mid-2025: Slack killed the standalone AI add-on ($10/user/mo) and folded AI features into every paid plan. Pro stayed at $7.25/user/mo annual. Business+ stayed at $12.50/user/mo annual. The net effect: Slack AI is now included at no extra cost, while Microsoft Copilot Business adds $18-21/user/mo on top of your Teams license (Enterprise Copilot is $30/user/mo).

Meanwhile, Microsoft announced M365 price increases effective July 1, 2026. Business Basic jumps from $6 to $7/user/mo, and Business Standard from $12.50 to $14/user/mo. Both plans gain Safe Links URL protection and 100GB email storage as part of the increase.

Cost comparison for a 50-person team (annual billing)

If AI features matter -- and they increasingly do for summarizing threads, generating meeting notes, and searching across conversations -- Slack is dramatically cheaper. A 50-person team on Slack Business+ with full AI costs $7,500/year. The same team on M365 Business Basic with Copilot Business costs $14,400/year at the promotional rate, or $16,200/year after the promo ends in June 2026.

Messaging and channels

Both platforms are built around channels (Slack) or teams/channels (Teams). The core messaging experience is similar: threads, reactions, file sharing, search, mentions.

Where Slack wins: The messaging UX is snappier and more responsive. Search is faster and more accurate -- especially with the new semantic search on Pro plans, which understands meaning rather than just matching keywords. Slack Connect lets you create shared channels with external organizations, invaluable for agencies, partners, and client work. Canvas (collaborative documents within channels) is more intuitive than Teams' Loop components. Message formatting, emoji reactions, and the overall feel of day-to-day messaging remain more polished.

Where Teams wins: Unlimited, searchable chat history on the free plan. Slack's free plan hides messages older than 90 days and permanently deletes data after 1 year. SharePoint-backed storage gives 1TB per user on paid plans (Slack offers 10-20GB). Loop components sync across Teams, Outlook, and Word, which is powerful if your workflows span Office apps. For organizations that live in the Microsoft ecosystem, this tight integration across email, calendar, files, and chat creates a unified workflow that Slack can't replicate without third-party tools.

Message search: a meaningful difference

Slack's search has always been its strongest feature. With semantic search now included on Pro plans, you can type natural-language queries like "what did Sarah say about the Q2 budget" and get synthesized answers across channels and threads. Teams search is serviceable but struggles with precision, especially across large organizations. If your team generates high message volume and needs to find information fast, this alone can justify Slack's higher price.

Video calling

This isn't close. Microsoft Teams wins video calling by a wide margin.

Slack Huddles are designed for spontaneous, informal conversations -- like walking over to someone's desk. They now include AI-generated notes on paid plans (someone in the huddle must enable them), but there's no video recording, no scheduled meetings, and no large-event capability. If video calling is a significant part of your workflow, you'll need Zoom, Google Meet, or another tool alongside Slack. Teams handles everything natively.

That said, "everything natively" comes with weight. Teams meetings consume more bandwidth and system resources than most alternatives. If your team primarily does quick audio check-ins rather than formal video meetings, Slack Huddles' simplicity is an advantage, not a limitation.

When to pair Slack with a dedicated video tool

Many Slack-first organizations use Zoom or Google Meet for scheduled meetings and all-hands while keeping Huddles for ad-hoc conversations. This adds cost ($13.33/user/mo for Zoom Workplace Pro, annual) but gives you best-in-class messaging (Slack) and best-in-class video (Zoom). If your team does fewer than 5 formal video meetings per week, Huddles plus a free Google Meet tier may suffice.

AI features

This is where the 2025 pricing changes made the biggest practical difference.

Slack AI (included in all paid plans):

• Pro plan: Channel and thread summaries, huddle notes (auto-generated when enabled), semantic search that synthesizes answers across conversations
• Business+ plan: Everything in Pro, plus AI-powered recaps, translations, workflow generation, and Slackbot -- a personal AI agent that uses your messages, files, channels, and connected tools to provide role-specific answers
• Enterprise+ exclusive: Cross-app search across Salesforce, Google Drive, GitHub, Jira, and more

Microsoft Copilot (separate license required):

• Copilot Business ($18-21/user/mo): Meeting summaries with speaker attribution and action items, chat summaries, AI-generated content in Word, Excel, PowerPoint, and Outlook, workflow automation via Power Automate
• Copilot Enterprise ($30/user/mo): Everything in Business, plus Microsoft Graph grounding (searches across your entire M365 data), custom agents, and plugins
• Free Copilot Chat: Available to all M365 users at no extra cost, but limited to web-based chat. As of April 15, 2026, Copilot Chat no longer works inside Word, Excel, PowerPoint, or OneNote -- you need a paid Copilot license for in-app AI.

Copilot is more powerful in scope -- it works across the entire Office suite, not just messaging. But the cost gap is stark. A 50-person team pays $0 extra for Slack AI on any paid plan. The same team pays $10,800-18,000/year extra for Copilot. The key question: do you need AI in Word, Excel, and PowerPoint, or primarily in chat and search?

AI value calculation

For teams that spend 80%+ of their communication time in chat, Slack AI delivers more value per dollar. You get thread summaries, semantic search, and AI-generated huddle notes without any additional spend. For teams that produce heavy document and spreadsheet work alongside meetings, Copilot's cross-suite AI justifies its cost -- but only if your team actually uses Word, Excel, and PowerPoint daily, not just occasionally.

Integrations

Slack has 2,600+ apps in its marketplace with 750,000+ custom bots deployed across all workspaces. Teams has roughly 1,400-2,000 apps via AppSource plus deep Power Platform integration.

Slack advantage: Developer-friendlier API with simpler custom bot creation. More third-party integrations, especially for dev tools (GitHub, Jira, Linear, Datadog, PagerDuty). The Salesforce integration is native and deep (Salesforce owns Slack since 2021) -- CRM records, deal coordination, revenue forecasting, and Agentforce AI agents all work within Slack channels. If your stack includes any combination of these tools, Slack's integrations are meaningfully better.

Teams advantage: Native Microsoft 365 integration is unmatched. Power Automate creates enterprise workflows without code. Power BI dashboards embed in channels. SharePoint document libraries, Planner task boards, and Loop components all live natively in Teams. Microsoft Graph API enables deep custom integrations across the entire Microsoft ecosystem. If your stack is Microsoft-centric, nothing comes close.

The Salesforce factor: Since the 2021 acquisition, Salesforce has invested heavily in making Slack the collaboration layer for its CRM. Sales teams running Salesforce get deal rooms, account channels, pipeline alerts, and now Agentforce AI agents that surface CRM insights directly in Slack. No equivalent depth exists for Teams, despite Dynamics 365 integrations.

Security and compliance

Teams has a clear edge for regulated industries. FedRAMP authorization across multiple security levels, Intune device management, and Azure AD conditional access policies give enterprise IT teams the granular control that Slack can't match without Enterprise Grid (custom pricing, typically $15-25/user/mo).

However, Slack's Enterprise Grid is not as inaccessible as it used to be. Organizations with 500+ users regularly negotiate Enterprise Grid pricing in the $15-18/user/mo range, which includes HIPAA compliance, data residency controls, and eDiscovery. For smaller organizations in regulated industries, Teams' lower-cost compliance features are a genuine advantage.

Mobile and desktop experience

Both apps work on iOS and Android. Slack is lighter and faster -- the app loads quicker and consumes less RAM. Teams is feature-richer but heavier, with high memory usage being a persistent complaint.

Desktop performance: Slack typically uses 300-500MB of RAM with 4-5 workspaces open. Teams regularly consumes 800MB-1.2GB -- sometimes more when running background processes for calendar sync, presence detection, and OneDrive integration. Microsoft shipped a rebuilt Teams client in late 2024 (based on WebView2 instead of Electron), which improved startup time by about 50% and reduced memory usage by roughly 30%. It's better than it was, but Slack still feels snappier for pure messaging workflows.

Mobile experience: App Store ratings tell a mixed story: Slack at roughly 3.7/5 on iOS and 4.4/5 on Android. Teams at roughly 3.8/5 on iOS and 4.2/5 on Android. Neither is winning awards for mobile experience, but Slack's is less frustrating for quick messaging throughout the day. Teams' mobile app tries to do too much -- meetings, files, calendar, chat, calls -- and the navigation can feel overwhelming.

File management: Teams surfaces SharePoint document libraries directly in channels, making co-editing Office files seamless. Slack's file handling is simpler -- drag, drop, preview -- but lacks native document collaboration. You'll need Google Docs, Notion, or another tool for real-time co-editing within Slack.

Migration considerations

Switching between Slack and Teams is painful. Here's what to expect:

Slack to Teams: You can export Slack workspace data (JSON format) and import message history into Teams, but channels, integrations, custom bots, and workflow automations need rebuilding from scratch. Budget 2-3 months of parallel operation for a team of 100+. The biggest friction point is Slack Connect channels with external partners -- there's no Teams equivalent that matches the experience.

Teams to Slack: Exporting from Teams is harder because data is spread across Teams messages, SharePoint files, and OneNote notebooks. Slack's import tools are more limited. Plan on 3-4 months for a full migration.

Running both: Some organizations use Teams for company-wide meetings and document collaboration, and Slack for team chat and developer workflows. It sounds wasteful, but if your company has both Microsoft 365 subscriptions and a strong engineering culture, running both can actually reduce friction. The cost overhead is Slack Pro ($7.25/user/mo) on top of your existing M365 license.

Who should pick what

Pick Slack if:

• Your team is primarily tech, developer, or startup culture
• You use Salesforce (native integration is unmatched since the acquisition)
• You collaborate with external partners or clients (Slack Connect)
• AI on a budget matters (bundled in all paid plans at no extra cost)
• Third-party integrations are critical (GitHub, Jira, Linear, Figma, Datadog)
• You value messaging speed and search quality over video features
• Your team generates high chat volume and needs to find information fast

Pick Microsoft Teams if:

• You already pay for Microsoft 365 (Teams is effectively free)
• Video meetings are a daily part of work (recording, breakout rooms, webinars)
• You're in a regulated industry needing FedRAMP, HIPAA, or device management
• Your team lives in Word, Excel, and PowerPoint
• Budget is your primary concern (Essentials at $4/user annual beats Slack Pro at $7.25)
• You need meetings with 300+ participants or webinar capability
• You want a single vendor for email, calendar, files, chat, and meetings

Pick both if:
You have Microsoft 365 for email and documents but an engineering team that lives in GitHub, Linear, and Jira. The $7.25/user/mo for Slack Pro alongside your M365 license is often less disruptive than forcing developers into a tool they'll resist using.

FAQ

Is Teams really free?
The standalone free plan exists with unlimited chat, 60-minute group calls, and 5GB storage. But most organizations get Teams through Microsoft 365 Business Basic ($6/user/mo, rising to $7 in July 2026), which adds 1TB storage, meeting recording, and web Office apps. Calling Teams "free" is technically true but misleading -- you're usually paying for it through your Microsoft subscription.

Did Slack get cheaper or more expensive in 2025?
Cheaper overall for most users. Pro stayed at $7.25/user/mo annual but now includes AI features that previously cost $10/user/mo extra. Business+ stayed at $12.50/user/mo annual and added Slackbot (personal AI agent) plus advanced AI features. If you were paying for the old Slack AI add-on, your total cost dropped significantly.

What's happening with Microsoft 365 pricing in July 2026?
Microsoft is raising prices across the board. Business Basic goes from $6 to $7/user/mo (+16.7%), Business Standard from $12.50 to $14/user/mo (+12%). Both plans gain Safe Links URL protection and 100GB email storage. If you're on an annual contract, renewing before July 1, 2026 locks in current pricing until your next renewal.

Can I migrate from Slack to Teams (or vice versa)?
You can export Slack workspace data (JSON format) and Teams supports data import, but the migration is messy. Message history transfers, but channels, integrations, custom bots, and workflow automations need rebuilding from scratch. Budget at least 2-3 months of overlap for a team of any size.

Which is better for a company under 20 people?
Slack Pro ($7.25/user annual) if chat, integrations, and developer tools matter most. Microsoft 365 Business Basic ($6/user, rising to $7 in July 2026) if you need Office apps, video meetings, and 1TB storage. The price difference is small -- focus on which ecosystem your existing tools live in.

What about the market share gap?
Teams' 320 million vs Slack's 42 million users is mostly a distribution story -- Teams comes free with Microsoft 365. In tech and startup communities, Slack remains dominant. Market share doesn't determine which tool is better for your specific team. What matters is whether your daily work revolves around Microsoft Office or a broader set of SaaS tools.

Compare Slack and Teams with other collaboration tools on Toolradar. Explore our team communication category for more options, or read our guide to collaboration tools for a deeper breakdown.