Slack vs Microsoft Teams vs Discord 2026 — Which Team Communication Tool Is Right for Your Business

The communication tool decision is 80% about ecosystem fit and 20% about features. The right answer follows where your team already lives.

AT A GLANCE

Microsoft Teams — for Microsoft 365 users

If your team already uses Microsoft 365, Teams is the answer — it is already paid for. Microsoft Teams is free with unlimited message history and a 60-minute meeting cap. Essentials at $4/seat/month lifts meetings to 300 minutes and adds 10GB storage. The value play is Microsoft 365 Business Basic at $6/seat/month — Teams plus Word, Excel, PowerPoint, Outlook, and 1TB OneDrive. The critical insight: if your team uses Microsoft 365 at any tier, Teams is already included at no additional cost.

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Slack — for integration-dependent teams

If your team relies on GitHub, Jira, Figma, or similar integrations, Slack is the answer. Slack Pro costs $8.75/seat/month, or $7.25/seat/month on annual billing — unlocking unlimited message history, unlimited integrations, and group video. The free tier's 90-day message history limit is the real constraint: after 90 days, messages are hidden, not deleted, but inaccessible without upgrading. For a 10-person team on Pro annual: $870/year. The same team on Teams Essentials: $480/year. Slack costs 81% more for the same core functionality — its justification is integration depth.

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Discord — for communities

If you run a community alongside your business, Discord is the answer. It is free for businesses using it as a communication tool — server creation, channels, voice, and video all cost nothing. Nitro ($9.99/month per user) and Server Boosts ($4.99 each) are optional upgrades, not requirements. The trade-off: Discord was built for communities, not business workflows. It lacks threaded channel conversations, task assignment, and formal approval flows.

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When it actually pays off

10-person team, 1 year:

Discord and Teams free both beat Slack free significantly on message history. The only reason to pay for Slack is integrations — specifically if your team relies on GitHub, Jira, Salesforce, or Figma, where Slack's integration depth beats Teams.

What nobody else mentions

Slack's 90-day free message limit is more painful than most articles convey. For teams using Slack as a searchable knowledge base, losing access to anything older than 90 days is genuinely limiting. Teams free has no such limit.

Microsoft Teams improved dramatically with its 2025 redesign — speed and reliability now match Slack. The UX gap that once justified Slack's premium has narrowed significantly.

Discord has a growing number of business users — agencies, creator businesses, and younger startups. The always-on voice channel model produces different team dynamics than Slack's text-first approach.

Teams includes Microsoft Copilot at the Microsoft 365 tier, while Slack AI costs an extra $10/seat/month. For Microsoft 365 users, the AI comparison favours Teams.

FAQ

Is Microsoft Teams free?

Yes, with unlimited message history and a 60-minute meeting cap. If you have any Microsoft 365 subscription, the full Teams is already included.

Why is Slack more expensive than Teams?

Slack charges per seat ($7.25–$12.50/seat/month) where Teams is bundled into Microsoft 365. For equivalent functionality, Slack costs roughly 80% more.

Can I use Discord for business?

Yes, and many agencies and creator businesses do. It is free but lacks business-specific features like threaded channels and task assignment.

Which has the best free plan?

Teams and Discord both offer unlimited message history free, beating Slack's 90-day limit. Teams is best for business workflows; Discord for community-style communication.