I use a self-hosted Plausible instance for privacy-focused, anonymous analytics.
It is free and open-source, so anyone can see exactly what is being tracked.

Plausible does not use cookies or store data on your browser for tracking. It does not collect any personal information, and all data is aggregated specifically to make individual user tracking infeasible. I self-host, so the data never leaves my server either.

For more information about exactly what and how data is tracked, check out their data policy.