Slack alternatives
Slack is a cloud team messaging platform organizing conversations into channels with integrations across hundreds of developer tools, file sharing, and searchable persistent message history.
6 OSS alts · ★ 169,906
Open-source Team Chat tools
1 SaaS tool · 6 OSS alternatives · 169,906★ combined
What to look for in self-hosted team chat
Team Chat tools live or die on user adoption. The OSS alternatives in this category usually nail the core feature set but lag the SaaS leaders on UX polish — mobile apps, real-time collaboration smoothness, search-as-you-type latency, and onboarding flows are the typical gaps. Pilot with a single team and watch which workflows generate friction. Migration succeeds when 80% of users find the new tool "fine" within two weeks.
SaaS tools in this category
Frequently asked questions
How many open-source team chat alternatives are tracked here?
6 OSS projects across 1 SaaS tool, with a combined 169,906★ on GitHub. Each SaaS page links its top 3 alternatives with stars, language, license, and migration tips.
Are these projects production-ready?
Maturity varies. We sort alternatives by GitHub stars on each SaaS page, but stars are a community-size signal, not a quality signal. Always check the last-pushed date and recent issue activity before depending on a project — a 50,000★ repo with no commits in 18 months is a red flag.
Can I trust the migration tips on each SaaS page?
The migration tips are AI-generated summaries based on the OSS project's documentation and known SaaS export formats. They cover the predictable gotchas (data shape, API differences, authentication) but they are not a substitute for a proper migration runbook. Treat them as a checklist starting point, not a complete plan.