PostHog

PostHog is an open-source product analytics platform founded in 2020 by James Hawkins and Tim Glaser, backed by Y Combinator and over twenty-seven million dollars in funding from investors including Fontinalis and Mischief, providing event tracking, session recording, feature flags, A/B testing, heatmaps, and user funnels as a self-hostable alternative to Amplitude and Mixpanel, adopted by over twenty thousand organizations including Y Combinator, Hasura, Vercel, and Webflow. The event analytics engine captures user interactions, page views, API calls, and custom events with unlimited event volume on open source, providing conversion funnels, retention charts, lifecycle analysis, path analysis, stickiness metrics, and SQL-powered insights through the HogQL query language, enabling product teams to understand user behavior without data engineering overhead. The session recording feature captures DOM mutations, mouse movements, clicks, scrolls, and network requests, replaying exact user sessions with privacy controls for masking sensitive inputs, enabling teams to visually debug user experience issues and understand real user behavior patterns. The feature flags and experiments system enables gradual rollouts, percentage-based traffic splitting, multivariate testing, and statistical significance calculation through Bayesian analysis, integrated with event tracking to measure the impact of feature variations on user behavior. The self-hosted deployment runs on Kubernetes or Docker with data stored in PostgreSQL and ClickHouse, providing complete data ownership and privacy compliance, while the cloud hosted option eliminates infrastructure management. The data pipeline supports batch and streaming ingestion. Designed for product managers, growth teams, and engineering organizations.