Slack vs Microsoft Teams for Small Business: Which Is Better?

Slack

Remote teams, hybrid teams, startups, agencies, support teams, product teams, sales teams, project teams, and businesses that need fast internal communication, organised channels, app notifications, file sharing, and external collaboration.

Microsoft Teams

Small businesses using Microsoft 365, Teams meetings, internal chat, video calls, remote collaboration, Outlook users, OneDrive and SharePoint file workflows, Microsoft Office documents, managed business accounts, webinars, and organisations that want communication inside the Microsoft ecosystem

Slack

Worth it for active team communication

Microsoft Teams

Best for Microsoft 365 communication

Slack

4.2/5

Microsoft Teams

4.4/5

Slack

Microsoft Teams

Slack

Yes — Slack has a free plan. It includes 90 days of message history, up to 10 app integrations, 1:1 huddles, 1:1 external messages through Slack Connect, and basic AI features. Paid plans are needed for unlimited message history, unlimited integrations, group huddles, broader Slack Connect use, stronger admin controls, SSO, SCIM, enterprise search, data loss prevention, and advanced security.

Microsoft Teams

Yes — Microsoft Teams has a free version for personal or very small-scale communication, but it should not be treated as a full business collaboration suite. Small businesses that need managed users, business email, Microsoft 365 apps, OneDrive, SharePoint, admin controls, security, longer-term governance, and proper company-wide collaboration should usually look at Teams Essentials or a Microsoft 365 business plan instead.

Slack

Web, Windows, macOS, iOS, Android

Microsoft Teams

Web, Windows, Mac, iOS, Android, browser, Microsoft 365, Outlook, OneDrive, SharePoint

Slack

Not listed

Microsoft Teams

Not listed

Slack

Not listed

Microsoft Teams

Not listed

Slack

Not listed

Microsoft Teams

Not listed

Slack

Slack is a workplace communication platform built around channels, messages, huddles, file sharing, app integrations, workflow automation, and searchable team conversations. It is best for teams that communicate regularly and need a faster alternative to long internal email threads. Slack works especially well for remote and hybrid teams, project updates, support discussions, cross-functional collaboration, and teams that rely on several connected tools. Its main weakness is distraction: without clear channel rules and notification habits, Slack can create noise and encourage constant context switching. Used well, it is one of the strongest tools for keeping team communication organised and accessible.

Microsoft Teams

Microsoft Teams is a communication and collaboration platform for chat, channels, meetings, calls, file sharing, webinars, and Microsoft 365 teamwork. It is strongest when used as part of the wider Microsoft ecosystem, especially alongside Outlook, OneDrive, SharePoint, Word, Excel, PowerPoint, Planner, Forms, Bookings, and Microsoft admin controls. It can feel heavier than Slack for simple messaging, but it is the better fit for businesses that want communication, meetings, files, Office apps, security, and administration connected through Microsoft 365.

Slack

Better if your small business wants a clean, dedicated team messaging app that is easy to adopt, strong for channels, and flexible across many third-party tools.

Microsoft Teams

Better if your small business already uses Microsoft 365 and wants chat, meetings, files, calendars, Office apps, OneDrive, SharePoint, and admin controls in one connected workspace.

Slack

Stronger if the team wants fast messaging, simple channels, searchable conversations, lightweight collaboration, and fewer Microsoft-style admin layers.

Microsoft Teams

Stronger if the team already uses Outlook, Word, Excel, PowerPoint, OneDrive, SharePoint, and Microsoft 365 accounts every day.

Slack

Better for focused chat, channel-based communication, informal updates, async discussions, quick huddles, and reducing email clutter.

Microsoft Teams

Good for chat and channels, but often feels more useful when tied into meetings, calendars, files, Teams groups, and Microsoft 365 workflows.

Slack

Useful for lightweight huddles and quick team calls, but not as strong as Teams for formal meeting workflows.

Microsoft Teams

Stronger for scheduled meetings, video calls, calendar integration, meeting chat, recordings, transcripts, webinars, and Microsoft 365 meeting workflows.

Slack

Stronger if your remote team values async-first communication, clean channels, external collaboration, app integrations, and fast searchable context.

Microsoft Teams

Stronger if your remote team needs meetings, file collaboration, Office documents, calendars, enterprise controls, and Microsoft 365-based workspaces.

Slack

Strong with Slack Connect for working with clients, partners, agencies, suppliers, and external collaborators in shared channels or messages.

Microsoft Teams

Useful for guest access and Microsoft 365-based collaboration, especially when external partners already use Microsoft accounts or Teams.

Slack

Stronger if your business uses a mixed software stack with tools such as Google Drive, Asana, Jira, GitHub, Salesforce, Zapier, Notion, or many SaaS apps.

Microsoft Teams

Stronger if your business mainly works inside Microsoft 365, including Outlook, OneDrive, SharePoint, Planner, Word, Excel, PowerPoint, and Microsoft security tools.

Slack

Good for sharing and discussing files, especially when connected to Google Drive, Dropbox, Box, or other tools.

Microsoft Teams

Stronger for document collaboration if your business uses OneDrive, SharePoint, Word, Excel, PowerPoint, and Microsoft file permissions.

Slack

Good for growing teams, with stronger controls on higher Slack plans such as Business+ and Enterprise+.

Microsoft Teams

Stronger if your business needs Microsoft identity, admin controls, device management, compliance, security policies, and Microsoft 365 governance.

Slack

Easier for many small teams because Slack is focused mainly on messaging, channels, huddles, and app integrations.

Microsoft Teams

Can be more powerful, but may feel heavier because Teams sits inside the wider Microsoft 365 structure.

Slack

Works with Microsoft tools, but it is not the natural centre of a Microsoft 365 workflow.

Microsoft Teams

The better fit if your business already pays for Microsoft 365 and wants communication inside the same suite.

Slack

Usually a better match if your team uses Gmail, Google Drive, Google Calendar, Google Meet, and a mixed set of cloud tools.

Microsoft Teams

Still works, but it may feel less natural if the team does not already use Microsoft 365.

Slack

Useful for small teams testing Slack, but the free plan has limits such as 90 days of searchable message history and up to 10 apps.

Microsoft Teams

Useful for personal or very small-scale use, but business use usually makes more sense through Teams Essentials or Microsoft 365 plans.

Slack

Better if your main need is team messaging, searchable history, app integrations, channels, huddles, and external collaboration.

Microsoft Teams

Better if you already need Microsoft 365 because Teams is bundled into broader business plans with email, storage, Office apps, and admin features.

Slack

Choose Slack if you want the cleaner and more focused team communication app, especially for async work, mixed software stacks, and simple collaboration.

Microsoft Teams

Choose Microsoft Teams if communication is part of a wider Microsoft 365 workflow involving Outlook, meetings, Office files, OneDrive, SharePoint, and business administration.

Slack

Avoid Slack if you already pay for Microsoft 365 and do not need a separate team messaging subscription.

Microsoft Teams

Avoid Microsoft Teams if your team wants a lighter, simpler communication tool and does not want to manage the wider Microsoft 365 ecosystem.