PostHog

Open-source product analytics platform that combines event tracking, session replay, feature flags, experiments, and error tracking in a single stack. Designed for product and engineering teams who want a self-hostable, data-centric alternative to stitching together separate analytics, feature-flag, and replay tools.

Trusted by companies including Supabase, ElevenLabs, Hasura, and ResearchGate. PostHog differentiates by offering a unified Product OS: analytics, feature flags, experiments, session replay, and a data warehouse in one place, with self-hosted or cloud deployment. SDKs support JavaScript, React, Python, Node, and many other frameworks.

Key capabilities:

• Product and web analytics with autocapture, funnels, retention, and path analysis
• Session replay with heatmaps for debugging UX and drop-off points
• Feature flags and A/B experiments with statistical significance
• Error tracking and logs for correlating bugs with user sessions
• Data warehouse, SQL editor, BI, and 120+ connectors for a unified customer data view
• Self-hosted deployment or managed cloud, with data staying under your control

Teams use PostHog to understand how users flow through the product, run experiments without engineering bottlenecks, roll out features gradually with flags, and debug issues by replaying sessions. Integrates with frontend frameworks and backends via SDKs, and can ingest data from Stripe, support tools, and error trackers for a single source of truth.