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Head-to-head · Team Chat Apps

Microsoft Teams vs Slack

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Microsoft Teams #1 in Team Chat Apps 9.4/10 Free plan Free plan✓ 2 of 2 features Try Microsoft Teams
Slack #2 in Team Chat Apps 9.3/10 Free plan Free plan✓ 2 of 2 features Visit Slack

Microsoft Teams leads on 0 checks, Slack on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMicrosoft Teams · 9.4/10
  • Free planboth

Microsoft Teams scores higher on our rubric for team chat apps: 9.4 against 9.3 out of 10; our editors rank them #1 and #2.

On message history, Microsoft Teams gives you Unlimited where Slack offers Limited.

Microsoft Teams is the better fit for organizations using Microsoft 365. Slack is the better fit for integration-heavy teams.

  • Microsoft Teams fits best

    Organizations using Microsoft 365

  • Slack fits best

    Integration-heavy teams

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Side by side

Feature Microsoft Teams 9.4/10 Visit ↗ Slack 9.3/10 Visit ↗
At a glance
Editor score 9.4 9.3
Ranking #1 in Team Chat Apps #2 in Team Chat Apps
Best for Organizations using Microsoft 365 Integration-heavy teams
Pricing model Free plan + paid Free plan + paid
Starting price — $7.25/user/mo
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop, Mobile Cloud, Desktop, Mobile
Platforms Web, Windows, macOS, Linux, iOS, Android Web, Windows, macOS, Linux, iOS, Android
Support Phone, Docs, Community Docs · 24/7
Compliance SOC 2, ISO 27001, HIPAA, 2FA SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML, 2FA
Integrations 250+ integrations 2,600+ integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Microsoft Teams 2/2 · Slack 2/2
Channels ✓ ✓
Guest access ✓ ✓
Specs
Message history Unlimited Limited
Integrations Microsoft 365, SharePoint, OneDrive, Outlook, Exchange, Planner, Forms, Power BI, OneNote, Power Apps, Power Automate, LinkedIn Salesforce, Jira, Google Drive, ChatGPT, Asana, Miro, Notion, Zoom, GitHub, GitLab, PagerDuty, Box, Dropbox, Zendesk, Freshdesk, HubSpot
Supported platforms web, Windows, macOS, Linux, iOS, Android web, windows, macos, linux, ios, android, api
Maximum members 25000 users Not checked yet
Our review
Pros
  • Free plan includes unlimited chat and group calling for 100 participants
  • Channels, meetings, recordings, workflows, guest access, and AI in one workspace
  • Works across web, desktop, mobile, Linux, and API environments
  • Channels, direct messages, huddles, guests, and Slack Connect
  • Broad integrations with Salesforce, Jira, GitHub, and other tools
  • Workflow automation, AI features, and enterprise administration
Cons
  • Paid plans and features vary by country, subscription, and license
  • Teams Premium requires an eligible Teams license
  • The 25,000-member limit applies per team, not an unlimited workspace
  • The Free plan includes only 90 days of message history
  • Paid access starts at $7.25 per user per month on annual billing
  • Enterprise+ requires contacting sales for pricing
Our verdict

Microsoft Teams combines one-to-one and group chat, channels, audio and video calling, online meetings, webinars, file sharing, collaborative apps, and external collaboration. It is suited to organizations that want communication and…

Read the review →

Slack organizes workplace communication around public and private channels, direct messages, shared spaces, and Slack Connect external messaging. It is aimed at teams that need structured conversations alongside searchable message and file…

Read the review →
  1. Microsoft TeamsTeam Chat Apps 9.4Free plan
  2. SlackTeam Chat Apps 9.3Free plan

Strengths and trade-offs

  • Microsoft Teams — where it wins

    • Free plan includes unlimited chat and group calling for 100 participants
    • Channels, meetings, recordings, workflows, guest access, and AI in one workspace
    • Works across web, desktop, mobile, Linux, and API environments

    Where it doesn't

    • Paid plans and features vary by country, subscription, and license
    • Teams Premium requires an eligible Teams license
    • The 25,000-member limit applies per team, not an unlimited workspace

  • Slack — where it wins

    • Channels, direct messages, huddles, guests, and Slack Connect
    • Broad integrations with Salesforce, Jira, GitHub, and other tools
    • Workflow automation, AI features, and enterprise administration

    Where it doesn't

    • The Free plan includes only 90 days of message history
    • Paid access starts at $7.25 per user per month on annual billing
    • Enterprise+ requires contacting sales for pricing

More comparisons

All team chat apps comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update