PostHog

Analytics Open source

An open-source product analytics platform with event tracking, session replay, feature flags, and A/B testing.

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About

What is PostHog?

PostHog is the all-in-one open-source product analytics platform for engineers and product teams. It replaces multiple tools with a unified platform covering event analytics, session replay, feature flags, A/B testing, surveys, and data pipelines — all in a single, self-hostable product. PostHog's generous free cloud tier (1M events/month) and open-source license make it the top choice for startups who want deep product insights without enterprise pricing. Its SQL-based analytics engine gives power users full flexibility.

Pros & Cons

Pros

  • All-in-one: analytics, session replay, feature flags, and A/B testing
  • Fully open-source and self-hostable
  • Generous free tier: 1 million events/month on PostHog Cloud
  • SQL access to your analytics data for custom queries
  • Feature flags and A/B testing built into the same platform
  • SDKs for Web, iOS, Android, React Native, Node.js, and more
  • Data warehouse sync to BigQuery, Snowflake, and Redshift

Cons

  • Self-hosting at scale requires significant infrastructure management
  • UI can feel complex for non-technical users
  • Some analytics features less polished than dedicated tools like Mixpanel
  • Session replay storage costs can add up at scale
  • Mobile SDK analytics less mature than web

Use Cases

Product analytics for tracking user behavior and funnel conversion Session replay for debugging UX issues and onboarding friction Feature flag management for gradual rollouts and experiments A/B testing for conversion rate optimization Replacing the Mixpanel + LaunchDarkly + FullStory stack with one tool
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