A PostHog alternative that surfaces why users churn, without building the analysis yourself

Yes, and it is worth being direct about that. PostHog covers funnels, retention, cohorts, paths, session replay, feature flags and experiments in one place, it is open source, and the free tier means a small team can run serious analytics for nothing. If you are an engineering-led team that wants to own its data and is comfortable building its own queries, PostHog is a strong default.

The honest limitation is scope. It is an instrument, and instruments answer the question you point them at. It will show you that 38 percent of new accounts never reach the second session, precisely and reliably. It will not tell you that they left because the import step silently fails on files over 10MB, because that fact lives in support tickets, not events.

Choose PostHog if the work you need done is behavioral and you have the engineering appetite to do it: you want to define events, build funnels, run experiments, self-host if it suits you, and keep costs near zero at low volume. It is very good at that and priced accordingly.

Choose UserInsight if the question you keep failing to answer is why. UserInsight unifies product usage with support tickets, app reviews, in-app feedback and survey responses, then clusters the recurring themes and ties them to behavior, so a churn spike arrives with a named reason and the exact evidence behind it. The two are not really competing on the same axis: one gives you better instruments, the other gives you the conclusion.

No, UserInsight is a hosted product. But the comparison people expect here deserves a correction, because PostHog's self-hosting story is weaker than almost every article about it suggests. PostHog is genuinely open source and publishes a Docker Compose deployment under an MIT license, so you can run it yourself for free. What its own documentation then says is that self-hosted deployments are officially unsupported, that all paid-plan features are Cloud-only, and that new deployments of the paid open source product using Kubernetes are no longer supported. PostHog's own guidance is that Cloud is the best experience for the vast majority of users.

So if the requirement driving your search is that every event must stay inside your infrastructure with vendor support behind it, verify that early rather than assuming PostHog solves it. The self-hosted build is a free-tier evaluation route, not a supported enterprise deployment. Where UserInsight meets the same underlying concern is privacy: analysis runs on aggregate, consented data with no PII exposed, and every insight traces back to the specific signals behind it, so security and legal teams get a reviewable trail rather than a black box.