PostHog

PostHog is an open source product analytics platform that combines event tracking, session recordings, feature flags, A/B testing, and surveys in a single tool. It was built for engineering teams who want to understand user behavior without sending data to third parties.

An All-in-One Product Stack

Most teams cobble together 5-6 different tools for analytics, session replay, experimentation, and feature management. PostHog replaces all of them with a single platform that shares the same data layer.

What You Get

• Product analytics - Funnels, trends, retention analysis, and user paths
• Session recordings - Watch exactly how users interact with your product
• Feature flags - Roll out features gradually with targeting rules
• A/B testing - Run experiments and measure impact on your metrics
• Surveys - Collect qualitative feedback directly in your product
• Data warehouse - Query your raw data with SQL
• Heatmaps - Visualize where users click, scroll, and engage

Generous Free Tier

The free plan includes 1 million events, 5,000 session recordings, and 1 million feature flag requests per month. For most early-stage startups, this is more than enough to run for months without paying.