1 SaaS tool · 4 OSS alternatives · 87,386★ combined
Web Analytics stacks lock you in through your historical data. Migrating off Web Analytics SaaS is rarely a clean cut — most teams run both systems in parallel for 4-12 weeks while validating that the OSS alternative produces the same numbers. Pay attention to event schema flexibility, retention defaults, and cohort/funnel modeling capabilities. The OSS alternatives below all handle event capture; the differentiation is in the analytical layer above.
Google Analytics 4 (GA4) is Google's web and app analytics platform providing event-based tracking of user behavior, acquisition channels, conversions, and retention. It replaced Universal Analytics in 2023. GA4's event model is more flexible than UA but requires more configuration to replicate common reporting use cases. The free tier has data sampling limitations for high-traffic properties.
4 OSS projects across 1 SaaS tool, with a combined 87,386★ on GitHub. Each SaaS page links its top 3 alternatives with stars, language, license, and migration tips.
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.
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.