Slack vs Microsoft Teams: Complete Comparison (2026) | Comparison
Microsoft Teams
Unified communications platform integrated with Microsoft 365, combining chat, calls, and meetings.
Enterprise teams using Microsoft 365
Quick Answer
AI SummarySlack is the pioneer of team messaging with a cleaner interface and better third-party integrations. Microsoft Teams has 320M+ daily active users — largely due to Office 365 bundling — and better video conferencing. Teams is free with Microsoft 365; Slack charges for most features.
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Slack for startups and developers who value integrations and UX. Teams for enterprises already using Microsoft 365. Teams wins on scale; Slack wins on experience.
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Key Differences at a Glance
- Daily Active Users:✓ Microsoft Teams wins(320M+ vs ~38M)
- Interface Quality:✓ Slack wins(Excellent vs Moderate)
- Video Calling:✓ Microsoft Teams wins(Excellent vs Good)
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Slack vs Microsoft Teams
Key Facts & Figures
18 numeric metrics compared
| Metric | Slack | Microsoft Teams | Ratio |
|---|---|---|---|
| Daily Active Users | ~38M | 320M+ | |
| App Integrations(count) | 2,600+ | ~700 | |
| Paid Starting Price(USD/user/mo) | $7.25 | Included with M365 | |
| Standalone Monthly Pricing (Pro Tier)(USD per user per month) | $7.25 | $6.00 (with Microsoft 365 Business Basic) | |
| Annual Cost per User (Pro Tier)(USD) | $87 (billed yearly) | $72 (bundled pricing) | |
| Video Meeting Capacity(participants) | Up to 2,000 (with paid plan) | Up to 10,000 | |
| Mobile App Feature Parity(%) | 95% | 85% | |
| Monthly Cost per 20-Person Team(USD) | $3,600 (Pro plan at $15/user) | — | — |
| Global Market Share(%) | 65% | — | — |
| Free Trial Duration(days) | 7 days | — | — |
| Message History Retention on Free Plan(count) | 10,000 most recent | — | — |
| Free Tier Meeting Participant Limit(participants) | Unlimited (Slack Huddles for video limited to 50 participants) | — | — |
| Asynchronous Communication Strength(scale 1-5) | 5 out of 5 (core feature with channels, threads, and history) | — | — |
| Google Workspace Integration Level | 2 out of 5 (available via integration, not native) | — | — |
| AI Features Count (2026)(features) | 30+ (CRM tools, meeting summaries, automation, SlackBot enhancements) | — | — |
| Base Monthly Cost Per User(USD) | $7.25 | — | — |
| Business+ Tier Monthly Cost Per User(USD) | $12.50 | — | — |
| Available Integrations(integrations) | 2000+ | — | — |
Sourced from publicly available data ·
Key Differences
5 attributes compared head-to-head
- ~38MDaily Active Users320M+(winner)
- Excellent(winner)Interface QualityModerate
- GoodVideo CallingExcellent(winner)
- $7.25+/user/moPriceIncluded in M365(winner)
- Superior(winner)Developer IntegrationsGood
- Daily Active Users
Slack
~38M
Microsoft Teams
320M+(winner)
- Interface Quality
Slack
Excellent(winner)
Microsoft Teams
Moderate
- Video Calling
Slack
Good
Microsoft Teams
Excellent(winner)
- Price
Slack
$7.25+/user/mo
Microsoft Teams
Included in M365(winner)
- Developer Integrations
Slack
Superior(winner)
Microsoft Teams
Good
Full Comparison
| Attribute | Slack | Microsoft Teams |
|---|---|---|
| Daily Active Users | ~38M | 320M+(winner) |
| App Integrations(count) | 2,600+(winner) | ~700 |
| Video Meeting Capacity(participants) | Up to 2,000 (with paid plan) | Up to 10,000(winner) |
| Native Office Integration | Limited (third-party connectors) | Native with SharePoint, OneDrive, Office Web Apps |
| AI Copilot Features | Slack AI (summarization, search, assisted writing) | Microsoft Copilot Pro (enterprise AI, meeting insights) |
| Message History Retention on Free Plan(count) | 10,000 most recent | — |
Show 4 more attributesFree Tier Meeting Participant Limit(participants) Unlimited (Slack Huddles for video limited to 50 participants) — Native Video Conferencing Huddles for brief video, limited to 50 participants; requires external tool for full conferencing — Meeting Recording & Auto-Transcription Not native; requires integration with Otter.ai or similar third-party services — Asynchronous Communication Strength(scale 1-5) 5 out of 5 (core feature with channels, threads, and history) — | ||
| Paid Starting Price(USD/user/mo) | $7.25(winner) | Included with M365 |
| Standalone Monthly Pricing (Pro Tier)(USD per user per month) | $7.25 | $6.00 (with Microsoft 365 Business Basic)(winner) |
| Annual Cost per User (Pro Tier)(USD) | $87 (billed yearly) | $72 (bundled pricing)(winner) |
| Monthly Cost per 20-Person Team(USD) | $3,600 (Pro plan at $15/user) | — |
| Base Monthly Cost Per User(USD) | $7.25 | — |
| Business+ Tier Monthly Cost Per User(USD) | $12.50 | — |
| Message Search Speed(seconds) | Excellent - optimized search indexing | 2-4 seconds average |
| Mobile App Feature Parity(%) | 95%(winner) | 85% |
| Global Market Share(%) | 65% | — |
| Free Trial Duration(days) | 7 days | — |
| Self-Hosting Available | No | — |
| Google Workspace Integration Level | 2 out of 5 (available via integration, not native) | — |
| AI Features Count (2026)(features) | 30+ (CRM tools, meeting summaries, automation, SlackBot enhancements) | — |
| Available Integrations(integrations) | 2000+ | — |
| Deployment Options | Cloud-based SaaS only | — |
Microsoft TeamsShow 4 more attributes
Pros & Cons
8 pros·6 cons across both
Slack
Pros
Cons
Microsoft Teams
Pros
Cons
Frequently Asked Questions
5 questions
Slack is generally preferred by small tech-forward teams for its cleaner UX, better third-party integrations, and more enjoyable day-to-day experience. The free plan (90-day message history, 10 integrations) works for early-stage teams. However, if the team already pays for Microsoft 365 Business Basic ($6/user/month), Teams is included at no extra cost — making it the more economical choice for budget-conscious small teams. The key question is whether the team prefers UX quality (Slack) or zero marginal cost within an existing Microsoft subscription (Teams).
Microsoft Teams has approximately 320 million monthly active users as of 2026, compared to Slack's approximately 20 million daily active users. The gap is largely structural — Teams is bundled into every Microsoft 365 subscription, giving it automatic deployment across millions of organizations without a separate procurement decision. Slack reached ~12M DAUs before the COVID-19 pandemic and has grown to ~20M, but Teams grew from 32M DAUs (March 2020) to 320M MAUs through Microsoft 365 bundling and the remote-work adoption wave.
Slack can reduce internal email significantly — many Slack-first organizations report 70-80% reductions in internal email volume. Channels organize conversations by project or topic, threads keep discussions focused, and Slack AI summarizes channels you missed. However, Slack does not replace email for external communication (client emails, vendor correspondence), formal documentation (compliance records, legal notices), or asynchronous communication with non-Slack users. Most organizations use Slack for internal real-time messaging and retain email for external and formal communication.
Yes — Teams has an app directory with 700+ integrations including GitHub, Jira, Salesforce, Zendesk, Asana, Trello, and many others. However, Slack's integration library (2,600+ apps) is significantly larger, and many developer tools (PagerDuty, DataDog, CircleCI) integrate more deeply with Slack than Teams. For organizations where developer tooling integrations are critical, Slack's ecosystem advantage is real and meaningful. For organizations where Microsoft 365 integration is the primary requirement, Teams' native integrations are unmatched.
Microsoft Teams has a free standalone plan for personal use and small teams. For organizations, Teams Essentials is $4/user/month (standalone, without Office apps). The key value, however, is that Teams is included in all Microsoft 365 Business and Enterprise subscriptions — Business Basic starts at $6/user/month and includes Teams plus cloud email, OneDrive, and web Office apps. For organizations already paying Microsoft 365, Teams has zero incremental cost, which is its strongest commercial argument against Slack.
Analysis: Slack vs Microsoft Teams
Slack and Microsoft Teams are the two dominant workplace communication platforms — but they represent fundamentally different philosophies: Slack built its product around conversation-first design and integrations, while Microsoft Teams built its platform around Office 365 deep integration and enterprise manageability. By 2026, Teams has far surpassed Slack in daily active user count, but Slack retains a loyal following among tech companies and developer-focused teams.
Slack (founded 2013, San Francisco; acquired by Salesforce for $27.7 billion in 2021): Slack pioneered the channel-based messaging format for workplaces and reached 12+ million daily active users before the pandemic. By 2026, Slack reports approximately 20 million DAUs and is deeply integrated into the Salesforce ecosystem (Salesforce Customer 360, Slack Canvas, Slack Lists). Slack's core strengths remain its user experience — the interface is widely considered more intuitive and enjoyable than Teams — and its integration library, with 2,600+ third-party app integrations via the Slack App Directory (GitHub, Jira, Zendesk, PagerDuty, Zapier, and hundreds more). Slack's 2024-2026 product focus has been Slack AI: summarization of channel history, thread summaries, search across your Slack history using natural language, and AI-assisted writing. Slack AI is included in Pro ($7.25/user/month) and above plans. Slack Canvas (document collaboration within Slack) and Slack Lists (lightweight project tracking) are Salesforce's attempt to make Slack a productivity platform, not just a messenger. Pricing: Free (90-day message history, 10 integrations); Pro $7.25/user/month; Business+ $12.50/user/month; Enterprise Grid (custom). The free tier's 90-day message history limit is Slack's most significant friction point for small teams.
Microsoft Teams (launched 2017, Microsoft, Redmond, Washington): Teams launched as a direct Skype for Business replacement and quickly became the enterprise communication standard, fueled by Microsoft's decision to include Teams in all Microsoft 365 Business and Enterprise subscriptions. By 2026, Microsoft Teams has approximately 320 million monthly active users — 16× Slack's DAU count. Teams' dominant position is largely structural: every organization with Microsoft 365 (formerly Office 365) already has Teams licensed, eliminating the procurement decision. Teams' strengths include native integration with Outlook (calendar-driven meetings appear automatically in Teams), SharePoint (file storage and collaboration), and the entire Microsoft 365 suite. Teams Rooms (video conferencing hardware certified for Teams) is the enterprise standard for conference room AV. Teams Phone (built-in telephony, replacing desk phones) is a significant enterprise feature that Slack does not offer. Teams Copilot (Microsoft 365 Copilot in Teams) provides AI-powered meeting transcription, summary, and action item extraction in real time — a technically impressive capability integrated at the OS level. Teams' main weaknesses are UX complexity (the interface is denser than Slack) and performance (the Electron-based desktop app has historically been slow to load, though the 2023 "New Teams" redesign improved this significantly).
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Key differences: Slack wins on UX quality, integration breadth, developer ecosystem, and enjoyment-of-use. Teams wins on enterprise scale, Microsoft 365 integration, meeting/phone capabilities, and zero incremental cost for Microsoft 365 organizations. For organizations already paying for Microsoft 365, choosing Slack over Teams represents a real additional spend ($87-150/user/year) for a product that does much of what Teams does.
The 2026 verdict: Teams is the rational default for any organization in the Microsoft ecosystem. Slack is the better product experience and makes sense for developer-centric companies, Salesforce-heavy organizations, or teams that prize integration depth and user experience over enterprise manageability.
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