Painful either direction. Pick once and commit for at least 2 years.

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.

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

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

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

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