Replacing Mixpanel is a decision about your event model, not about which charts look nicer. What matters is whether a tool stores raw events you can query outside its own dashboards, how it resolves user identity across anonymous and logged-in sessions, and how it handles late-arriving events. PostHog is the closest to a full replacement here: autocapture or manual events, funnels and retention, plus session replay, feature flags, and SQL access to the underlying data. OpenPanel covers similar product-analytics ground, including funnels, cohorts, session replay, and revenue tracking, built on ClickHouse so event queries stay fast.
The tools split by how deep you go. Countly leans toward mobile and engagement, collecting sessions, views, events, and crash reports and adding push notifications and a Compliance Hub for consent and data-subject requests, which suits app teams with privacy obligations. Umami is the lightweight, cookie-free end of the range: simple traffic analytics with no consent banner, better suited to understanding site usage than to deep behavioral funnels. Match the tool to the questions your product team actually asks rather than to a feature checklist.
Migration is mostly about preserving meaning. Export Mixpanel's raw events with their timestamps, distinct IDs, and properties, since that is the asset worth keeping, then accept that saved funnels, cohorts, and dashboards usually have to be rebuilt because query semantics rarely map one-to-one. Get identity right before importing anything, because a bad merge of anonymous and known users quietly corrupts every funnel and retention curve. Then emit events to both systems for a while and compare counts before you cut the SDKs over.