Slack vs Teams: Best Chat Tool for Startups (2026)

Compare Slack and Microsoft Teams for startups — cost, integrations, and which fits venture-backed vs bootstrapped teams.

Slack vs Microsoft Teams for Startups (2026)

Slack dominates venture-backed startups. Teams wins when the company is already on Microsoft 365 for email and docs.

Slack fits

Startups on Google Workspace, engineering-heavy teams, and any org with a rich third-party integration stack.

Teams fits

Microsoft 365 shops, enterprise sales orgs, and companies with strict compliance needs.

Cost

Teams is effectively free if you already pay for Microsoft 365. Slack's per-seat pricing adds up past 20 employees.

Frequently asked questions

Which do YC companies use?
Overwhelmingly Slack.
Migration?
Painful either direction. Pick once and commit for at least 2 years.

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•By Alejandro Cremades