PostHog bundles the product-data stack — analytics, session replay, feature flags, experiments, surveys and a data warehouse — into one open-source platform priced by usage. Engineers like that it is self-serve, SQL-queryable and deployable without a data team, and the free tier covers a surprising amount of real usage.
It suits engineering-led teams that want to understand feature usage without stitching together four vendors. If you only need to count visits, Plausible or Fathom is simpler; PostHog earns its keep when you act on the data with flags and experiments.