Posthog

PostHog is an open-source product analytics and experimentation platform designed to help engineering and product teams understand user behavior and ship better features faster. It consolidates analytics, session replay, feature flags, A/B testing, and data pipelines into a single, developer-friendly stack. The primary purpose of PostHog is to give teams full visibility into how users interact with their product, without relying on multiple disconnected tools or heavy vendor lock-in.

Key capabilities include event-based analytics for tracking user actions, funnels, retention, and paths, as well as session replay to watch real user sessions and diagnose issues. PostHog provides feature flags and experiments so teams can roll out features gradually, run A/B tests, and measure impact directly against product metrics. It also offers product-led growth tools such as in-product surveys and feature usage tracking, plus integrations and APIs to send data to and from warehouses and other systems. A major advantage is the ability to self-host for full data ownership, with robust privacy controls and support for EU and compliance-sensitive environments.